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<h1>
    <?php 
     
    $current = $post->ID;
     
    $parent = $post->post_parent;
     
    $grandparent_get = get_post($parent);
     
    $grandparent = $grandparent_get->post_parent;
     
    ?>
     
    <?php if ($root_parent = get_the_title($grandparent) !== $root_parent = get_the_title($current)) {echo get_the_title($grandparent); }else {echo get_the_title($parent); }?>
 
</h1>