public function get_secondary( $args = array(), $sort = true ) {
		$params = wp_parse_args( $args, array( 'parent_slug' => '' ) );

		// No need to search children if the parent is not set.
		if ( empty( $params['parent_slug'] ) && empty( $params['secondary'] ) ) {
			return false;
		}

		$secondary_nav = wp_list_filter( $this->nav[ $this->object_id ], $params );

		if ( ! $secondary_nav ) {
			return false;
		}

		if ( true !== $sort ) {
			return $secondary_nav;
		}

		return $this->sort_nav( $secondary_nav );
	}