Show menu based on parent & ancestor

Work around. 

if (is_page( 'pagename' ) || in_array("5", $post->ancestors)) {
wp_nav_menu( array( 'container_class' => 'subnav', 'menu' => 'visit' ));

}

5 being the ID of the page in question.

So while this is a bit more work, needing and if / if:else statement for each page, it will scale to allow as many child / grandchild pages as needed

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