Code to display all child levels (2nd and 3rd)

I’m using the current code to display a parent page and its children:

global $post; return (is_page(‘programs’) || ($post->post_parent==”124″));

This does not capture the 2nd and 3rd level children underneath page ID 124. How can I capture that without writing individual logic for each of those? Thanks!

https://www.ads-software.com/plugins/widget-logic/