diff --git a/app/imports/api/engine/computation/buildComputation/tests/computeInactiveStatus.testFn.js b/app/imports/api/engine/computation/buildComputation/tests/computeInactiveStatus.testFn.js
index c7565156..463a072f 100644
--- a/app/imports/api/engine/computation/buildComputation/tests/computeInactiveStatus.testFn.js
+++ b/app/imports/api/engine/computation/buildComputation/tests/computeInactiveStatus.testFn.js
@@ -2,8 +2,9 @@ import { buildComputationFromProps } from '/imports/api/engine/computation/build
 import { assert } from 'chai';
 import clean from '../../utility/cleanProp.testFn.js';
 
-export default function(){
+export default function () {
   let computation = buildComputationFromProps(testProperties);
+
   const bySelf = (propId, note) => assertDeactivatedBySelf(computation, propId, note);
   const byAncestor = (propId, note) => assertDeactivatedByAncestor(computation, propId, note);
   const active = (propId, note) => assertActive(computation, propId, note);
@@ -24,22 +25,22 @@ export default function(){
 
   // Notes
   active('NoteId', 'Notes should be active');
-  byAncestor('NoteChildId', 'children of notes should always be inactive');
+  active('NoteChildId', 'children of notes should be active');
 }
 
-function assertDeactivatedBySelf(computation, propId, note){
+function assertDeactivatedBySelf(computation, propId, note) {
   const prop = computation.propsById[propId];
   assert.isTrue(prop.deactivatedBySelf, note);
   assert.isTrue(prop.inactive, note + '. The property should be inactive');
 }
 
-function assertDeactivatedByAncestor(computation, propId, note){
+function assertDeactivatedByAncestor(computation, propId, note) {
   const prop = computation.propsById[propId];
   assert.isTrue(prop.deactivatedByAncestor, note);
   assert.isTrue(prop.inactive, 'The property should be inactive');
 }
 
-function assertActive(computation, propId, note){
+function assertActive(computation, propId, note) {
   const prop = computation.propsById[propId];
   assert.isNotTrue(prop.inactive, note);
   assert.isNotTrue(prop.deactivatedBySelf, note);
@@ -51,66 +52,90 @@ var testProperties = [
   clean({
     _id: 'itemUnequippedId',
     type: 'item',
-    ancestors: [{id: 'charId'}],
+    parentId: 'charId',
+    left: 1,
+    right: 4,
   }),
   clean({
     _id: 'itemUnequippedChildId',
     type: 'folder',
-    ancestors: [{id: 'charId'}, {id: 'itemUnequippedId'}],
+    parentId: 'itemUnequippedId',
+    left: 2,
+    right: 3,
   }),
   clean({
     _id: 'itemEquippedId',
     type: 'item',
     equipped: true,
-    ancestors: [{id: 'charId'}],
+    parentId: 'charId',
+    left: 5,
+    right: 8,
   }),
   clean({
     _id: 'itemEquippedChildId',
     type: 'folder',
-    ancestors: [{id: 'charId'}, {id: 'itemEquippedId'}],
+    parentId: 'itemEquippedId',
+    left: 6,
+    right: 7,
   }),
   // Spells
   clean({
     _id: 'spellPreparedId',
     type: 'spell',
-    ancestors: [{id: 'charId'}],
+    parentId: 'charId',
     prepared: true,
+    left: 9,
+    right: 12,
   }),
   clean({
     _id: 'spellPreparedChildId',
     type: 'folder',
-    ancestors: [{id: 'charId'}, {id: 'spellPreparedId'}],
+    parentId: 'spellPreparedId',
+    left: 10,
+    right: 11,
   }),
   clean({
     _id: 'spellAlwaysPreparedId',
     type: 'spell',
-    ancestors: [{id: 'charId'}],
+    parentId: 'charId',
     alwaysPrepared: true,
+    left: 13,
+    right: 16,
   }),
   clean({
     _id: 'spellAlwaysPreparedChildId',
     type: 'folder',
-    ancestors: [{id: 'charId'}, {id: 'spellAlwaysPreparedId'}],
+    parentId: 'spellAlwaysPreparedId',
+    left: 14,
+    right: 15,
   }),
   clean({
     _id: 'spellUnpreparedId',
     type: 'spell',
-    ancestors: [{id: 'charId'}],
+    parentId: 'charId',
+    left: 17,
+    right: 20,
   }),
   clean({
     _id: 'spellUnpreparedChildId',
     type: 'folder',
-    ancestors: [{id: 'charId'}, {id: 'spellUnpreparedId'}],
+    parentId: 'spellUnpreparedId',
+    left: 18,
+    right: 19,
   }),
   // Notes
   clean({
     _id: 'NoteId',
     type: 'note',
-    ancestors: [{id: 'charId'}],
+    parentId: 'charId',
+    left: 21,
+    right: 24,
   }),
   clean({
     _id: 'NoteChildId',
     type: 'folder',
-    ancestors: [{id: 'charId'}, {id: 'NoteId'}],
+    parentId: 'NoteId',
+    left: 22,
+    right: 23,
   }),
 ];
diff --git a/app/imports/api/engine/computation/buildCreatureComputation.js b/app/imports/api/engine/computation/buildCreatureComputation.js
index 776d0db5..44d0edf4 100644
--- a/app/imports/api/engine/computation/buildCreatureComputation.js
+++ b/app/imports/api/engine/computation/buildCreatureComputation.js
@@ -1,4 +1,4 @@
-import { docsToForest as nodeArrayToTree } from '/imports/api/parenting/parentingFunctions';
+import { docsToForest } from '/imports/api/parenting/parentingFunctions';
 import { DenormalisedOnlyCreaturePropertySchema as denormSchema }
   from '/imports/api/creature/creatureProperties/CreatureProperties';
 import { getProperties, getCreature, getVariables } from '/imports/api/engine/loadCreatures.js';
@@ -12,7 +12,7 @@ import computeToggleDependencies from './buildComputation/computeToggleDependenc
 import linkCalculationDependencies from './buildComputation/linkCalculationDependencies.js';
 import linkTypeDependencies from './buildComputation/linkTypeDependencies.js';
 import computeSlotQuantityFilled from './buildComputation/computeSlotQuantityFilled.js';
-import CreatureComputation from './CreatureComputation.ts';
+import CreatureComputation from './CreatureComputation';
 import removeSchemaFields from './buildComputation/removeSchemaFields.js';
 
 /**
@@ -86,7 +86,7 @@ export function buildComputationFromProps(properties, creature, variables) {
   });
 
   // Get all the properties as trees based on their ancestors
-  let forest = nodeArrayToTree(properties);
+  let forest = docsToForest(properties);
   // Walk the property trees computing things that need to be inherited
   walkDown(forest, node => {
     computeInactiveStatus(node);