Hey.
Figured out a way to do it, hope it helps anyone that comes around the same question.
My piece of code:
$section_childs = get_pages('child_of=1');
$section_pages = array(1);
foreach($section_childs as $section_child) {
array_push($section_pages,$section_child->ID);
}
if ( is_page($section_pages)) {
wp_list_pages( 'child_of=1&title_li=' );
} else {
echo "error";
}
Thanks!