Hello PudyastaSatria
The Friends Day Pass Youth is the same as the Saver Day Pass but for people under 25 years of age. It is valid and good to go to Grindelwald but not for mountain excursions to Jungfraujoch, Grindelwald First, or Männlichen.
All members of the party need to have with them their physical nation identity card or passport. The ticket inspectors can ask for the passports at any time.
Kind regards,
Roland