<div class="dc1">
    <!-- stuff -->
    <div id="id1">
        <div class="dc3 in" id="unique1">
             <ul class="ul1">
                 <li> stuff </li>
             </ul>
        </div>
        <div class="dc3 in" id="unique2">
             <ul class="ul1">
                 <li> stuff </li>
             </ul>
        </div>
        <div class="dc3 in" id="unique3">
             <ul class="ul1">
                 <li> stuff </li>
             </ul>
        </div>
    </div>
</div>

Document doc = Jsoup.connect(pageURL).get();
Elements outerDiv = doc.select("div#id1");
Elements innerDiv = outerDiv.select("div.dc3.in");

Document doc = Jsoup.connect(pageURL).get();
Elements outerDiv = doc.select("div#id1 > div");