code: function ($oneSibling, siblingCount, existingSibligCount) {
        var lines = '';
        for (var i = 0; i < existingSibligCount; i++) {
          lines += '<td class="leftLine topLine"></td><td class="rightLine topLine"></td>';
        }
        $oneSibling.parent().prevAll('tr:gt(0)').children().attr('colspan', siblingCount * 2)
          .end().next().children(':first').after(lines);
      }
docs: subsequent processing of build sibling nodes