/a></span><span class="op">(</span></span>
<span>  <span class="op">~</span><span class="va">id</span>, <span class="op">~</span><span class="va">momcol</span>, <span class="op">~</span><span class="va">dadcol</span>,</span>
<span>  <span class="st">"pid"</span>, <span class="st">"mom"</span>, <span class="st">"dad"</span>,</span>
<span>  <span class="st">"sib"</span>, <span class="st">"mom"</span>, <span class="st">"dad"</span>,</span>
<span>  <span class="st">"mhs"</span>, <span class="st">"mom"</span>, <