We are 2 adults and 1 child (11 year-old) going to buy a ticket and seat reservation from Zurich to Interlaken, via the Lucerne-Interlaken Panaroma Express. Our trip is on 23 June and we will be having a Half Fare Card. As I read, the child can travel free with this Half Fare Card.
So, my question is when I buy the ticket and seat reservation via shop.luzern.com/en/routing/zentralbahn, do I need to add my child as a passenger? (eventhough he can travel free). If yes, what should I tick in the Reduction box, there are 3 options: Only Reservation, No discount and Half Fare Travelcard. Need your expert advise. Thank you so much!