Profile: Patrick

$left_id = 168;
$right_id = 169;
 
// get the intermediate post(s) between these two posts
$intermediate_ids = toolset_get_related_posts( 
 
    array( 'parent' => array($left_id), 'child' => array($right_id) ), // origin post ID(s)
    'left-right', // slug of relationship
    array ('role_to_return' => 'intermediary')
);
$intermediate_id = $intermediate_ids[0];