Get child pages relationship - Carbon Fields

cdk_child_carbon_relationship_options

/**
 * Child pages filter
 *
 */
function cdk_child_carbon_relationship_options( $options, $field_name ) {

    if ($field_name == '_featured_articles') {
        $parent_id = $_GET['post'];
        $args = array(
            'post_type' => 'page',
            'numberposts' => -1,
            'post_parent__in' => array($parent_id)
        );
        $posts = get_posts($args);
        $post_ids = [];
        if ($posts)
            foreach ($posts as $post)
            {
                $post_ids[] = $post->ID;
            }

        foreach($options as $index => $page) {
            if (!in_array($page['id'], $post_ids)) {
                unset($options[$index]);
            }
        }
    }
    return $options;
}
add_filter('carbon_relationship_options', 'cdk_child_carbon_relationship_options', 10, 2 );