I'm trying to figure out how to combine "mine" and "friends" into one river tab. This is what I got so far but it isn't working. Any suggestions?

pages/river.php

switch ($page_type) {
    case 'mine':
        $title = elgg_echo('river:mine');
        $page_filter = 'mine';
        $options['subject_guid'] = elgg_get_logged_in_user_guid();
        break;
    case 'friends':
        $title = elgg_echo('river:friends');
        $page_filter = 'friends';
        $options['relationship_guid'] = elgg_get_logged_in_user_guid();
        $options['relationship'] = 'friend';
        break;
    case 'combined':
        $title = elgg_echo('river:mine');
        $page_filter = 'combined';
        $options['relationship_guid' . 'subject_guid'] = elgg_get_logged_in_user_guid();
        $options['relationship'] = 'friend';
        break;
    default:
        $title = elgg_echo('river:all');
        $page_filter = 'all';
        break;
}