diff --git a/examples/react/src/examples/NodeResizer/index.tsx b/examples/react/src/examples/NodeResizer/index.tsx
index a4f59ada..397c1f22 100644
--- a/examples/react/src/examples/NodeResizer/index.tsx
+++ b/examples/react/src/examples/NodeResizer/index.tsx
@@ -128,7 +128,7 @@ const initialNodes: Node[] = [
     data: { label: 'Parent', keepAspectRatio: true },
     position: { x: 700, y: 0 },
     width: 300,
-    height: 400,
+    height: 300,
     style: { ...nodeStyle },
   },
   {
@@ -148,7 +148,9 @@ const initialNodes: Node[] = [
     id: '5b',
     type: 'defaultResizer',
     data: { label: 'Child with expandParent' },
-    position: { x: 150, y: 100 },
+    position: { x: 100, y: 100 },
+    width: 100,
+    height: 100,
     parentId: '5',
     expandParent: true,
     style: { ...nodeStyle },
@@ -187,7 +189,6 @@ const CustomNodeFlow = () => {
       minZoom={0.2}
       maxZoom={5}
       snapToGrid={snapToGrid}
-      nodeOrigin={[1, 1]}
       fitView
       onlyRenderVisibleElements
     >
diff --git a/packages/react/src/additional-components/NodeResizer/NodeResizeControl.tsx b/packages/react/src/additional-components/NodeResizer/NodeResizeControl.tsx
index 517dbd9f..7f1139c1 100644
--- a/packages/react/src/additional-components/NodeResizer/NodeResizeControl.tsx
+++ b/packages/react/src/additional-components/NodeResizer/NodeResizeControl.tsx
@@ -84,8 +84,8 @@ function ResizeControl({
                 height,
                 ...evaluateAbsolutePosition(
                   {
-                    x: change.x ?? node.internals.positionAbsolute.x,
-                    y: change.y ?? node.internals.positionAbsolute.y,
+                    x: change.x ?? node.position.x,
+                    y: change.y ?? node.position.y,
                   },
                   { width, height },
                   node.parentId,
@@ -94,6 +94,7 @@ function ResizeControl({
                 ),
               },
             };
+            console.log(child);
 
             const parentExpandChanges = handleExpandParent([child], nodeLookup, parentLookup, nodeOrigin);
             changes.push(...parentExpandChanges);
diff --git a/packages/react/src/components/NodeWrapper/index.tsx b/packages/react/src/components/NodeWrapper/index.tsx
index 515fc78c..be14ff77 100644
--- a/packages/react/src/components/NodeWrapper/index.tsx
+++ b/packages/react/src/components/NodeWrapper/index.tsx
@@ -39,7 +39,6 @@ export function NodeWrapper<NodeType extends Node>({
   rfId,
   nodeTypes,
   nodeExtent,
-  nodeOrigin,
   onError,
 }: NodeWrapperProps<NodeType>) {
   const { node, internals, isParent } = useStore((s) => {
@@ -87,7 +86,9 @@ export function NodeWrapper<NodeType extends Node>({
   const nodeDimensions = getNodeDimensions(node);
   const inlineDimensions = getNodeInlineStyleDimensions(node);
   // TODO: clamping should happen earlier
-  let clampedPosition = nodeExtent ? clampPosition(internals.positionAbsolute, nodeExtent) : internals.positionAbsolute;
+  const clampedPosition = nodeExtent
+    ? clampPosition(internals.positionAbsolute, nodeExtent)
+    : internals.positionAbsolute;
 
   const hasPointerEvents = isSelectable || isDraggable || onClick || onMouseEnter || onMouseMove || onMouseLeave;
 
diff --git a/packages/react/src/container/GraphView/index.tsx b/packages/react/src/container/GraphView/index.tsx
index 8050ca20..d74a0fdb 100644
--- a/packages/react/src/container/GraphView/index.tsx
+++ b/packages/react/src/container/GraphView/index.tsx
@@ -32,7 +32,6 @@ export type GraphViewProps<NodeType extends Node = Node, EdgeType extends Edge =
       | 'noPanClassName'
       | 'defaultViewport'
       | 'disableKeyboardA11y'
-      | 'nodeOrigin'
     >
   > & {
     rfId: string;
@@ -97,7 +96,6 @@ function GraphViewComponent<NodeType extends Node = Node, EdgeType extends Edge
   noWheelClassName,
   noPanClassName,
   disableKeyboardA11y,
-  nodeOrigin,
   nodeExtent,
   rfId,
   viewport,
@@ -186,7 +184,6 @@ function GraphViewComponent<NodeType extends Node = Node, EdgeType extends Edge
           noPanClassName={noPanClassName}
           noDragClassName={noDragClassName}
           disableKeyboardA11y={disableKeyboardA11y}
-          nodeOrigin={nodeOrigin}
           nodeExtent={nodeExtent}
           rfId={rfId}
         />
diff --git a/packages/react/src/container/NodeRenderer/index.tsx b/packages/react/src/container/NodeRenderer/index.tsx
index 39b20323..2b178ae5 100644
--- a/packages/react/src/container/NodeRenderer/index.tsx
+++ b/packages/react/src/container/NodeRenderer/index.tsx
@@ -22,7 +22,6 @@ export type NodeRendererProps<NodeType extends Node> = Pick<
   | 'noDragClassName'
   | 'rfId'
   | 'disableKeyboardA11y'
-  | 'nodeOrigin'
   | 'nodeExtent'
   | 'nodeTypes'
 >;
@@ -72,7 +71,6 @@ function NodeRendererComponent<NodeType extends Node>(props: NodeRendererProps<N
             id={nodeId}
             nodeTypes={props.nodeTypes}
             nodeExtent={props.nodeExtent}
-            nodeOrigin={props.nodeOrigin}
             onClick={props.onNodeClick}
             onMouseEnter={props.onNodeMouseEnter}
             onMouseMove={props.onNodeMouseMove}
diff --git a/packages/react/src/container/ReactFlow/index.tsx b/packages/react/src/container/ReactFlow/index.tsx
index 64ac7202..31f7c315 100644
--- a/packages/react/src/container/ReactFlow/index.tsx
+++ b/packages/react/src/container/ReactFlow/index.tsx
@@ -217,7 +217,6 @@ function ReactFlow<NodeType extends Node = Node, EdgeType extends Edge = Edge>(
           noPanClassName={noPanClassName}
           rfId={rfId}
           disableKeyboardA11y={disableKeyboardA11y}
-          nodeOrigin={nodeOrigin}
           nodeExtent={nodeExtent}
           viewport={viewport}
           onViewportChange={onViewportChange}
diff --git a/packages/react/src/types/nodes.ts b/packages/react/src/types/nodes.ts
index a01a894a..71e03036 100644
--- a/packages/react/src/types/nodes.ts
+++ b/packages/react/src/types/nodes.ts
@@ -1,12 +1,5 @@
 import type { CSSProperties, MouseEvent as ReactMouseEvent } from 'react';
-import type {
-  CoordinateExtent,
-  NodeBase,
-  NodeOrigin,
-  OnError,
-  NodeProps as NodePropsBase,
-  InternalNodeBase,
-} from '@xyflow/system';
+import type { CoordinateExtent, NodeBase, OnError, NodeProps as NodePropsBase, InternalNodeBase } from '@xyflow/system';
 
 import { NodeTypes } from './general';
 
@@ -59,7 +52,6 @@ export type NodeWrapperProps<NodeType extends Node> = {
   disableKeyboardA11y: boolean;
   nodeTypes?: NodeTypes;
   nodeExtent?: CoordinateExtent;
-  nodeOrigin: NodeOrigin;
   onError?: OnError;
 };
 
diff --git a/packages/react/src/types/store.ts b/packages/react/src/types/store.ts
index 7bf6e692..52ffae5d 100644
--- a/packages/react/src/types/store.ts
+++ b/packages/react/src/types/store.ts
@@ -54,7 +54,7 @@ export type ReactFlowStore<NodeType extends Node = Node, EdgeType extends Edge =
   transform: Transform;
   nodes: NodeType[];
   nodeLookup: NodeLookup<InternalNode<NodeType>>;
-  parentLookup: Map<string, InternalNode<NodeType>[]>;
+  parentLookup: Map<string, Map<string, InternalNode<NodeType>>>;
   edges: Edge[];
   edgeLookup: EdgeLookup<EdgeType>;
   connectionLookup: ConnectionLookup;
diff --git a/packages/svelte/src/lib/store/initial-store.ts b/packages/svelte/src/lib/store/initial-store.ts
index 073f206c..34d3635b 100644
--- a/packages/svelte/src/lib/store/initial-store.ts
+++ b/packages/svelte/src/lib/store/initial-store.ts
@@ -107,7 +107,7 @@ export const getInitialStore = ({
     flowId: writable<string | null>(null),
     nodes: createNodesStore(nodes, nodeLookup, parentLookup),
     nodeLookup: readable<NodeLookup<InternalNode>>(nodeLookup),
-    parentLookup: readable<Map<string, InternalNode[]>>(parentLookup),
+    parentLookup: readable<Map<string, Map<string, InternalNode>>>(parentLookup),
     edgeLookup: readable<EdgeLookup<Edge>>(edgeLookup),
     visibleNodes: readable<InternalNode[]>([]),
     edges: createEdgesStore(edges, connectionLookup, edgeLookup),
diff --git a/packages/svelte/src/lib/store/utils.ts b/packages/svelte/src/lib/store/utils.ts
index 5fd66cfe..4eb402dc 100644
--- a/packages/svelte/src/lib/store/utils.ts
+++ b/packages/svelte/src/lib/store/utils.ts
@@ -13,7 +13,8 @@ import {
   type PanZoomInstance,
   type ConnectionLookup,
   type EdgeLookup,
-  type NodeLookup
+  type NodeLookup,
+  type ParentLookup
 } from '@xyflow/system';
 
 import type { DefaultEdgeOptions, DefaultNodeOptions, Edge, InternalNode, Node } from '$lib/types';
@@ -128,7 +129,7 @@ export type NodeStoreOptions = {
 export const createNodesStore = (
   nodes: Node[],
   nodeLookup: NodeLookup<InternalNode>,
-  parentLookup: Map<string, InternalNode[]>
+  parentLookup: ParentLookup<InternalNode>
 ): {
   subscribe: (this: void, run: Subscriber<Node[]>) => Unsubscriber;
   update: (this: void, updater: Updater<Node[]>) => void;
diff --git a/packages/system/src/types/nodes.ts b/packages/system/src/types/nodes.ts
index a6cf407f..afe1b3fa 100644
--- a/packages/system/src/types/nodes.ts
+++ b/packages/system/src/types/nodes.ts
@@ -154,4 +154,4 @@ export type NodeHandle = Optional<HandleElement, 'width' | 'height'>;
 export type Align = 'center' | 'start' | 'end';
 
 export type NodeLookup<NodeType extends InternalNodeBase = InternalNodeBase> = Map<string, NodeType>;
-export type ParentLookup<NodeType extends InternalNodeBase = InternalNodeBase> = Map<string, NodeType[]>;
+export type ParentLookup<NodeType extends InternalNodeBase = InternalNodeBase> = Map<string, Map<string, NodeType>>;
diff --git a/packages/system/src/utils/general.ts b/packages/system/src/utils/general.ts
index 95a02f81..f2087ab9 100644
--- a/packages/system/src/utils/general.ts
+++ b/packages/system/src/utils/general.ts
@@ -118,29 +118,6 @@ export const devWarn = (id: string, message: string) => {
   }
 };
 
-export const getPositionWithOrigin = ({
-  x,
-  y,
-  width,
-  height,
-  origin = [0, 0],
-}: {
-  x: number;
-  y: number;
-  width: number;
-  height: number;
-  origin?: NodeOrigin;
-}): XYPosition => {
-  if (!width || !height || origin[0] < 0 || origin[1] < 0 || origin[0] > 1 || origin[1] > 1) {
-    return { x, y };
-  }
-
-  return {
-    x: x - width * origin[0],
-    y: y - height * origin[1],
-  };
-};
-
 export const snapPosition = (position: XYPosition, snapGrid: SnapGrid = [1, 1]): XYPosition => {
   return {
     x: snapGrid[0] * Math.round(position.x / snapGrid[0]),
@@ -243,7 +220,7 @@ export function nodeHasDimensions<NodeType extends NodeBase = NodeBase>(node: No
  */
 export function evaluateAbsolutePosition(
   position: XYPosition,
-  dimensions: { width: number; height: number },
+  dimensions: { width?: number; height?: number } = { width: 0, height: 0 },
   parentId: string,
   nodeLookup: NodeLookup,
   nodeOrigin: NodeOrigin
@@ -257,10 +234,8 @@ export function evaluateAbsolutePosition(
 
     if (parent) {
       const origin = parent.origin || nodeOrigin;
-      const xOffset = (parent.measured.width ?? 0) * origin[0];
-      const yOffset = (parent.measured.height ?? 0) * origin[1];
-      positionAbsolute.x += parent.internals.positionAbsolute.x - dimensions.width * nodeOrigin[0];
-      positionAbsolute.y += parent.internals.positionAbsolute.y - dimensions.height * nodeOrigin[1];
+      positionAbsolute.x += parent.internals.positionAbsolute.x - (dimensions.width ?? 0) * origin[0];
+      positionAbsolute.y += parent.internals.positionAbsolute.y - (dimensions.height ?? 0) * origin[1];
     }
   }
 
diff --git a/packages/system/src/utils/store.ts b/packages/system/src/utils/store.ts
index 60184f16..87accbc0 100644
--- a/packages/system/src/utils/store.ts
+++ b/packages/system/src/utils/store.ts
@@ -15,7 +15,6 @@ import {
   NodeDimensionChange,
   NodePositionChange,
   ParentLookup,
-  Dimensions,
 } from '../types';
 import { getDimensions, getHandleBounds } from './dom';
 import { getBoundsOfRects, getNodeDimensions, isNumeric, nodeToRect } from './general';
@@ -23,8 +22,8 @@ import { getNodePositionWithOrigin } from './graph';
 import { ParentExpandChild } from './types';
 
 export function updateAbsolutePositions<NodeType extends NodeBase>(
-  nodeLookup: Map<string, InternalNodeBase<NodeType>>,
-  parentLookup: Map<string, InternalNodeBase<NodeType>[]>,
+  nodeLookup: NodeLookup<InternalNodeBase<NodeType>>,
+  parentLookup: ParentLookup<InternalNodeBase<NodeType>>,
   options: UpdateNodesOptions<NodeType> = {
     nodeOrigin: [0, 0] as NodeOrigin,
     elevateNodesOnSelect: true,
@@ -49,8 +48,8 @@ type UpdateNodesOptions<NodeType extends NodeBase> = {
 
 export function adoptUserNodes<NodeType extends NodeBase>(
   nodes: NodeType[],
-  nodeLookup: Map<string, InternalNodeBase<NodeType>>,
-  parentLookup: Map<string, InternalNodeBase<NodeType>[]>,
+  nodeLookup: NodeLookup<InternalNodeBase<NodeType>>,
+  parentLookup: ParentLookup<InternalNodeBase<NodeType>>,
   options: UpdateNodesOptions<NodeType> = {
     nodeOrigin: [0, 0] as NodeOrigin,
     elevateNodesOnSelect: true,
@@ -94,8 +93,8 @@ export function adoptUserNodes<NodeType extends NodeBase>(
 
 function updateChildPosition<NodeType extends NodeBase>(
   node: InternalNodeBase<NodeType>,
-  nodeLookup: NodeLookup,
-  parentLookup: ParentLookup,
+  nodeLookup: NodeLookup<InternalNodeBase<NodeType>>,
+  parentLookup: ParentLookup<InternalNodeBase<NodeType>>,
   options: UpdateNodesOptions<NodeType> = {
     nodeOrigin: [0, 0] as NodeOrigin,
     elevateNodesOnSelect: true,
@@ -111,9 +110,9 @@ function updateChildPosition<NodeType extends NodeBase>(
   // update the parentLookup
   const childNodes = parentLookup.get(parentId);
   if (childNodes) {
-    childNodes.push(node);
+    childNodes.set(node.id, node);
   } else {
-    parentLookup.set(parentId, [node]);
+    parentLookup.set(parentId, new Map([[node.id, node]]);
   }
 
   const selectedNodeZ: number = options?.elevateNodesOnSelect ? 1000 : 0;
@@ -160,7 +159,7 @@ export function handleExpandParent(
 ): (NodeDimensionChange | NodePositionChange)[] {
   const changes: (NodeDimensionChange | NodePositionChange)[] = [];
   const parentExpansions = new Map<string, { expandedRect: Rect; parent: InternalNodeBase }>();
-
+  console.log(children)
   // determine the expanded rectangle the child nodes would take for each parent
   for (const child of children) {
     const parent = nodeLookup.get(child.parentId);
@@ -168,14 +167,13 @@ export function handleExpandParent(
       continue;
     }
 
-    const parentRect =
-      parentExpansions.get(child.parentId)?.expandedRect ?? nodeToRect(parent, parent.origin ?? nodeOrigin);
-
+    const parentRect = parentExpansions.get(child.parentId)?.expandedRect ?? nodeToRect(parent);
     const expandedRect = getBoundsOfRects(parentRect, child.rect);
 
     parentExpansions.set(child.parentId, { expandedRect, parent });
   }
 
+
   if (parentExpansions.size > 0) {
     parentExpansions.forEach(({ expandedRect, parent }, parentId) => {
       // determine the position & dimensions of the parent
@@ -208,8 +206,7 @@ export function handleExpandParent(
 
         // We move all child nodes in the oppsite direction
         // so the x,y changes of the parent do not move the children
-        const childNodes = parentLookup.get(parentId);
-        childNodes?.forEach((childNode) => {
+        parentLookup.get(parentId)?.forEach((childNode) => {
           if (!children.some((child) => child.id === childNode.id)) {
             changes.push({
               id: childNode.id,
@@ -295,7 +292,7 @@ export function updateNodeInternals<NodeType extends InternalNodeBase>(
           },
         };
         if (node.parentId) {
-          updateChildPosition(node, nodeLookup, parentLookup, { nodeOrigin });
+           updateChildPosition(node, nodeLookup, parentLookup, { nodeOrigin });
         }
 
         updatedInternals = true;