# GetLowestCommonAncestor(AccessibilityNode, AccessibilityNode)

> Retrieves the lowest common ancestor of two nodes in the accessibility hierarchy.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine.Accessibility](/engine/6000.3/script-reference/unityengine/accessibility.md)
* **Assembly:** UnityEngine.AccessibilityModule

```csharp
public AccessibilityNode GetLowestCommonAncestor(AccessibilityNode firstNode, AccessibilityNode secondNode)
```

### Parameters

**** (\[AccessibilityNode]\(/engine/6000.3/script-reference/unityengine/accessibility/accessibilitynode)): The first node to find the lowest common ancestor of.**** (\[AccessibilityNode]\(/engine/6000.3/script-reference/unityengine/accessibility/accessibilitynode)): The second node to find the lowest common ancestor of.

### Returns

| Type                                                                                                | Description                                                                                        |
| --------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------- |
| [AccessibilityNode](/engine/6000.3/script-reference/unityengine/accessibility/accessibilitynode.md) | The lowest common ancestor of the two given nodes, or `null` if they don't have a common ancestor. |

### Remarks

The lowest common ancestor is the node that both nodes share in their path to the root node of their branch in the hierarchy.