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    // skip pages without password
    if (!is_page() || !post_password_required()) {
        return;
    }

if ( $post->post_parent == '2' ) {
  // stuff
}

if ( is_page(2) ) {
  // stuff
}

<?php
      // get data from custom field
      the_meta(); // level: 1
      if (null !== get_post_meta(get_the_ID(), 'level', true)) {
         $level = get_post_meta(get_the_ID(), 'level', true);
         echo $level . '/9';
      }
?>