if statement with child pages, and grandchild pages?

I have an if statement that brings up specific versions of a header and the sidebar for pages, and it works great for the parent and child pages, but once you hit the grandchild pages it disappears. How would I specify an unlimited depth in the statement?

Here’s a sample of the code:

<?php } else if ( is_page('360') || is_child_page_of('360') ) { ?>  

		<div class="product_head">
			HEADER STUFF
		</div>

<?php } else if ( is_page('363') || is_child_page_of('363') ) { ?>

Thanks!