Tree function for changiworks only for the parent page, but not for the subpages

Hi,

I found a proposal for changing the logo for different sections in this support forum, but it does not work. I paste you what I wrote. Please tell me what is wron.

function is_tree($pid) {
global $post;
if(is_page()&&($post->post_parent==$pid||is_page($pid)))
return true;
};

add_filter(‘avf_logo’,’av_change_logo’);
function av_change_logo($logo)
{
if(is_tree(11097) )
{
$logo = “https://www.myDomain.es/wp-content/uploads/2019/02/logo-1.jpg”;
}
else if(is_tree(11171) )
{
$logo = “https://www.myDomain.es/wp-content/uploads/2019/02/logo-2.jpg”;
}
else if(is_tree(11880) )
{
$logo = “https://www.myDomain.es/wp-content/uploads/2019/02/logo-3.jpg”;
}
return $logo;
}