Hello, our group will be traveling with 2 children younger than 6 years old. As we are interested in the Gotthard panoramic express, will we need to also get seat reservations for them - since they do not pay for their ticket? Do not want to end up in a situation where they have to share our seats just because I didn't reserve/pay for them.Also, I am considering the first class Swiss pass because firstly, the Gotthard express requires first class tickets anyway and also secondly, my main concern is not getting seats on busy rides or not getting seats as a family. This is considering the fact I have 2 young children and luggages, it is preferable we seat together. My itinerary is as such - Zurich > Lucerne > Lugano (via Gotthard express) > Grindewald > Zurich. Is the first class pass worth it? Thank you in advance for any advice!