return (node.getParent() == getParent() && getParent() != null);
return node.getParent() == getParent() && getParent() != null;
  public boolean isNodeSibling(TreeNode node)  {    if (node == null)			return false;    if (node == this)      return true;    return (node.getParent() == getParent()            && getParent() != null);  }