DIsplay child navigation within child page

Hey, I currently have a navigation bar displaying all the children of that specific page using the following snippet

<div id="sub_nav_del">
                    <h4>Take a seat</h4>
                    <?php
                    $pages = get_pages('child_of='.$post->ID.'&sort_column=menu_order');
                    $count = 0;
                    foreach($pages as $page)
                    { ?>

                    <ul>
                        <li>
                        <h5 class="del">
                            <a href="<?php echo get_page_link($page->ID) ?>"><?php echo $page->post_title ?></a>
                        </h5>
                        </li>
                        </ul>
                    <?php
                    }
                    ?>

However I would like the navigation to still be displayed if I am on one of the child pages.