Return true if parent page id matches

You can get all ancestors with get_post_ancestors.
The root ancestor is the last element of the returned array.
Here is the function that checks a target page id against the root ancestor of current page:

function check_page_parent( $target_page_id ) {
    $ancestors = get_post_ancestors( get_the_ID() );

    if ( $ancestors ) {
        $top_most_parent_index = count( $ancestors ) - 1;
        $top_most_parent_id    = $ancestors[ $top_most_parent_index ];

        return ( $top_most_parent_id == $target_page_id);
    }

    return false;
}