construct_covmat</a></span><span class="op">(</span>fam_vec <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"f"</span>, <span class="st">"m"</span>, <span class="st">"mgm"</span>, <span class="st">"pgm"</span>, <span class="st">"mhs1"</span>, <span class="st">"phs1"</span>, <span class="st">"mau"</span>, <span class="st">"pau"</span><span class="op">)</span>, h2 <span class="op">=</span> <span clas