This seemed to work nicely for me;
<?php
$children = get_pages('child_of=".$post->ID);
if( count( $children ) != 0 ) {
$id = $post->ID;
} else {
$id = $post->post_parent;
}
$args = array(
"post_type' => 'page',
'post_parent' => $id,
'posts_per_page' => -1
);
$system_query = new WP_Query($args);
if ($system_query->have_posts()) :
while ($system_query->have_posts()) : $system_query->the_post();
?>
<!-- list of child pages here -->
<?php endwhile; endif; wp_rest_postdata(); ?>
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