<ul id="nav">
            <?php
                foreach ($family as $key => $value) {
                    $depth = 2;
                    if($family["$key"]["depth"] == $depth) {
                        echo '
                        <li><a href="#">'.$family["$key"]["label"].'</a><ul>';
                            $depth++;
                            foreach ($family as $key => $value) {
                                if($family["$key"]["depth"] == $depth && $family["$key"]["id_parent"] == 1) {
                                echo '<li><a href="#">'.$family["$key"]["label"].'</a></li>';
                                }
                            }
                            echo '</ul>';
                        echo '</li>';
                    }
                }
            ?>
        </ul>