Hello Whuesejott64
Welcome in the SBB Community.
All our national public transit services have free seating, with the exception of three touristic trains
- PE Glacier Express (GEX),
- PE Gotthard Panorama Express GoPEX),
- PE GoldenPass Express (GPX), and
- and some mountain pass excursion tour buses operated by Postauto
The bus you are talking about is used by the locals, too, to go after their daily business. They would not be happy if they had to reserve a seat for each ride.
That said, the Swiss Family Card is the child’s ticket when travelline while being accompanied by you.
Does that make sense?
Kind regards,
Roland