RolandP Thank you very much! Ah, SBB website doesn’t handle the STP discount; that helps explain that puzzle for me.
I have a follow-up question for you - my guest is a little concerned that with the family, they could run a bit late to catch the train to Grindelwald Terminal and so may not have time to stop and buy the ticket from the ticket office in Grindelwald. Obviously, the goal is to leave plenty of time but in case not, is it possible to buy it from the SBB app (using “GA travelcard 1st class” and Junior travelcard for the adult and child respectively as the “travelcard for Switzerland” in passenger/co-passenger settings since you can buy it while on the go?
I appreciate you mentioning that the inspectors can even sell the tickets on the train. But I’m concerned that I read that if you don’t have a valid ticket on the trains, the inspectors fine you for that (?).
And thanks for your note about the travel pass. They will not be spending most of their time in the Jungfrau region while in Switzerland. It’s just Jungfraujoch is on their bucket list so they are staying a couple days in Grindelwald to go there.
Many thanks!!