List of child pages with title of parent page Wordpress

                    <!--TITLE OF PARENT PAGE-->
                        <?php
                        echo empty($post->post_parent) ? get_the_title($post->ID) : get_the_title($post->post_parent);
                        ?>
                    <!--LIST OF CHILD PAGES-->
                        <?php
                        if ($post->post_parent)
                            $children = wp_list_pages("title_li=&child_of=" . $post->post_parent . "&echo=0");
                        else
                            $children = wp_list_pages("title_li=&child_of=" . $post->ID . "&echo=0");
                        if ($children) {
                            ?>
                            <ul>
                                <?php echo $children; ?>
                            </ul>
                        <?php } ?>