$('.target').siblings().css('background', '#ffa').append(' <span class="label label-info">siblings for .target</span>'); $('.target').siblings('.selected').append(' <span class="label">siblings with class .selected</span>');
<ul> <li class="selected">list item .selected</li> <li>list item</li> <li class="target">list item <strong>.target</strong></li> <li class="selected">list item .selected</li> <li>list item</li> </ul>