code: function() {
          var sib =  this.parent.children.slice(0);
          for (var i=0;i < sib.length && sib[i] != this;i++) {}
          sib.splice(i,1);
          if (sib.length) { return sib; }
          return null;
      }
docs: Returns a node array of this node's siblings, null if none.
  @method getSiblings
  @return Node[]