WP - Get Child Pages from Parent

            <?php $page_parent = 10;?>
        <?php //query_posts(array('showposts' => 1, 'orderby' => 'rand', 'post_parent' => $page_parent, 'post_type' => 'page')); while (have_posts()) { the_post(); ?>
      <?php
                        $args = array(
                            'posts_per_page' => 1,
                            'orderby' => 'rand',
                            'post_parent' => $page_parent,
                            'post_type' => 'page',
                        );
                        $pages = new WP_Query($args);
            ?>
            <?php if($pages->have_posts()){ $pages->the_post(); ?>
            <div class="the-title"><?php the_title(); ?></div>
      <?php }?>