Hello Wogepho62
Welcome to the SBB Community.
If you are all under 25 years of age, and you use a GA Travel Card Youth, you can take one person with you using the Tandem Day Pass. The day pass must be purchased on behalf of the person travelling with you.
https://www.sbb.ch/en/tickets-offers/tickets/day-passes/tandem-day-pass.html
If you are all under 25 years of age, you can take advantage of the Friends Day Pass for Youth. The GA does not grant additional discounts, however.
https://www.sbb.ch/en/tickets-offers/tickets/day-passes/friends-day-pass-youth.html
If you are all above 25 years of age, there is no discount. Your friends or relatives can make use of the Swiss Travel Pass, Swiss Half Fare Card, Saver Day Passes, Day Passes, (Saver) Point-to-Point tickets, or any other regional tourist pass such as Berner Oberland Pass.
Kind regards,
Roland