<p>Lists the root or organizational units (OUs) that serve as the immediate parent of the specified child OU or account. This operation, along with <a>ListChildren</a> enables you to traverse the tree structure that makes up this root.</p> <note> <p>Always check the <code>NextToken</code> response parameter for a <code>null</code> value when calling a <code>List*</code> operation. These operations can occasionally return an empty set of results even when there are more results available. The <code>NextToken</code> response parameter value is <code>null</code> <i>only</i> when there are no more results to display.</p> </note> <p>This operation can be called only from the organization's management account or by a member account that is a delegated administrator for an Amazon Web Services service.</p> <note> <p>In the current release, a child can have only a single parent.</p> </note>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}