Displaying a link to latest grandchild on frontpage

Hi!

I have a page (“testimonials”). It has 3 subpages (“children”) : “press”, “people”, “enterprises”.

Each of them subpages have their own subpages (grandchildren of “Testimonials”), which are the actual testimonials.

I would like to display on my frontpage whenever there is a new grandchild. How can i do that?

I tried using get_pages() like this:

$myposts = get_pages('number=1&child_of=28&sort_column=post_date&sort_order=desc&parent=');

But no luck: it either displays a child or nothing.

Your help would be much appreciated.