Aug 31, 2011 - 8:56 AM
Hello shrdlu, and welcome to the forum! As for your questions:
1) Free traveling with the STS Family Card is only meant for children, not grandchildren. Your best option is to purchase a Grandchild Travelcard
for each child at a Swiss railway station. Free traveling along with a grandparent is allowed for CHF 30.00 per child.
2) The discount is 50%. Please refer to the map we link to at the Swiss Half Fare Card page
for an overview of validity.
3) The Swiss Half Fare Card is valid for the Swiss leg of the trip. For the French trip, the regular fares apply.
4) Yes, you can purchase the pass at the Geneva railway station.
I hope this helps you out!