Hello. I will be in Switzerland for 1 week in July with my 15 year old son. My son will be travelling on the train on day trips sometimes with me and sometimes with his Aunty who as a Swiss Citizen holds a Swiss Pass Travel Card. I believe my son can travel with his Aunty for free but I will need to purchase a Junior Travel Card or a CoTravel Card to allow my son to travel for free with me. Could someone tell me if I have understood this correctly. Many thanks