How to show grandchildren when on a grandchild page

Thanks – I did come across that, and I think it should work, but I’m a bit confused about how to actually plug the code into my theme. I want to list the pages generated in an list, so how would I do that? What I mean is, in the example code above, there’s the:

<ul>
  <?php echo $children; ?>
  </ul>
  <?php } ?>

which obviously generates the list. But in the code that I think I want:

<?php
$output = wp_list_pages('echo=0&depth=1&title_li=<h2>Top Level Pages </h2>' );
if (is_page( )) {
  $page = $post->ID;
  if ($post->post_parent) {
    $page = $post->post_parent;
  }
  $children=wp_list_pages( 'echo=0&child_of=' . $page . '&title_li=' );
  if ($children) {
    $output = wp_list_pages ('echo=0&child_of=' . $page . '&title_li=<h2>Child Pages</h2>');
  }
}
echo $output;
?>

I don’t see that, or know what to do with it.

Great, thanks. That worked once I did that, but it was generating the list of all the sub-pages and sub-sub-pages on the 2nd level pages. So, I modified it as follows so that on the 2nd level page it displays just the child pages of that page. Here’s the code:

<?php $output = wp_list_pages('echo=0&depth=1&title_li=<h2>Top Level Pages </h2>' );
			  if (is_page( )) { $page = $post->ID;
			  if ($post->post_parent) { $page = $post->post_parent; }

			  $children=wp_list_pages( 'echo=0&child_of='.$post->post_parent.'&title_li=&depth=1' );

			  if ($children) { $output = wp_list_pages ('echo=0&child_of='.$post->ID.'&title_li=<h2>In This Section</h2>&depth=1'); } } echo $output; ?>

I have one more question though: on 3rd level pages, how do I get a list of the sibling pages to display? (Basically the same list as appears on the 2nd level page.)

Thanks so much for the suggestion, I appreciate it. Unfortunately, that didn’t work like what I wanted – it was generating the full page hierarchy on each page.

BUT, I have been looking around, and think I may have found a solution. The easiest way to illustrate is probably to show you the URLs of what I mean.

1st level – http://new.usy.org/yourusy/
2nd level – http://new.usy.org/yourusy/communications/
3rd level – http://new.usy.org/yourusy/communications/regional-communications-vps/

When I use this code:

<?php
// If CHILD_OF is not NULL, then this page has a parent
// Therefore, list siblings i.e. subpages of this page's parent
if($post->post_parent){
    wp_list_pages('title_li=<h2>In This Section:</h2>&child_of='.$post->post_parent);
    }

// If CHILD_OF is zero, this is a top level page, so list subpages only.
else{
    wp_list_pages('title_li=<h2>In This Section:</h2>&depth=1&child_of='.$post->ID);
    }
?>

it works as intended on the 1st and 3rd level pages, but not the 2nd. There’s also another bit of code I found:

<?php $output = wp_list_pages('echo=0&depth=1&title_li=<h2>Top Level Pages </h2>' );
			  if (is_page( )) { $page = $post->ID;
			  if ($post->post_parent) { $page = $post->post_parent; }

			  $children=wp_list_pages( 'echo=0&child_of='.$post->post_parent.'&title_li=&depth=1' );

			  if ($children) { $output = wp_list_pages ('echo=0&child_of='.$post->ID.'&title_li=<h2>In This Section</h2>&depth=1'); } } echo $output; ?>

which worked on the 1st and 2nd levels, but not the 3rd.

I just can’t figure out how to combine those two codes so that they work as intended on all 3 levels. I’m not so much of a coder, so any help you can provide would be much appreciated.