diff --git a/src/lib/utils/checklist.test.ts b/src/lib/utils/checklist.test.ts
index c235827..c3905b3 100644
--- a/src/lib/utils/checklist.test.ts
+++ b/src/lib/utils/checklist.test.ts
@@ -112,6 +112,21 @@ describe('toggleItemWithCascade', () => {
 		expect(result[0].checked).toBe(false);
 		expect(result[0].parentId).toBeNull();
 	});
+
+	it('unchecking a child repositions it after its parent and siblings', () => {
+		// Simulates: parent + 2 children, one child checked (at end of array as done item)
+		const items: ChecklistItem[] = [
+			{ id: '1', text: 'Parent', checked: false, parentId: null },
+			{ id: '3', text: 'Child B', checked: false, parentId: '1' },
+			{ id: '4', text: 'Other', checked: false, parentId: null },
+			{ id: '2', text: 'Child A', checked: true, parentId: '1' }  // done, at end
+		];
+		const result = toggleItemWithCascade('2', items);
+		// Child A should be repositioned after Child B (last sibling), not stay at end
+		const ids = result.map(i => i.id);
+		expect(ids).toEqual(['1', '3', '2', '4']);
+		expect(result.find(i => i.id === '2')!.checked).toBe(false);
+	});
 });
 
 describe('indentItem', () => {
diff --git a/src/lib/utils/checklist.ts b/src/lib/utils/checklist.ts
index 73d68af..9843ad8 100644
--- a/src/lib/utils/checklist.ts
+++ b/src/lib/utils/checklist.ts
@@ -31,11 +31,29 @@ export function toggleItemWithCascade(id: string, items: ChecklistItem[]): Check
 		return item;
 	});
 
-	// When unchecking a child from done: if parent no longer exists, orphan it
+	// When unchecking a child: reposition it after its parent/siblings in the array
+	// (otherwise it stays at the end of the array where done items live)
 	if (!newChecked && target.parentId) {
 		const parentExists = result.some((i) => i.id === target.parentId);
 		if (!parentExists) {
+			// Parent deleted — orphan it
 			result = result.map((i) => (i.id === id ? { ...i, parentId: null } : i));
+		} else {
+			// Remove the item from its current position
+			const uncheckedItem = result.find((i) => i.id === id)!;
+			result = result.filter((i) => i.id !== id);
+			// Find the last sibling or the parent, insert after it
+			let insertAfter = -1;
+			for (let i = 0; i < result.length; i++) {
+				if (result[i].id === target.parentId || result[i].parentId === target.parentId) {
+					insertAfter = i;
+				}
+			}
+			if (insertAfter >= 0) {
+				result.splice(insertAfter + 1, 0, uncheckedItem);
+			} else {
+				result.push(uncheckedItem);
+			}
 		}
 	}