How does the Swiss Family Card work?
You simply need to take it along while traveling with your Swiss Travel System rail pass. That's all you need to enjoy free traveling for your children.
You need to make sure that the Swiss Family Card is valid before you start traveling. In nearly all cases the Swiss Family Card comes as a print at home product, and there is nothing you need to do other than checking if the personal particulars printed on the card are correct.
If the card is shipped to you, then see the card for details on how to validate it. You usually need to fill out the names of the parent(s), the names of the children, and their birth dates.
Traveling with the Swiss Family Card
Once you have a valid Swiss Family Card and Swiss Travel System rail pass, you can use them to travel. The Swiss Family Card is valid where and when your rail pass is valid. Validity of the Swiss Family Card ends when validity of the rail pass ends.
On board the train
Once you're on board, you will need to present your rail pass and the Swiss Family Card to ticket controllers upon request. The controller may want to check your passport as well, to make sure you're the owner of the presented pass and the parent of the children.
If the pass for the parents includes free entrance to museums, this applies to the children too. An example is the Swiss Travel Pass.
What if the child is turning 16 during the trip?
The age on the start date of the pass of the parents counts. If the child is 15 on that date, the Swiss Family Card remains valid for the duration of the pass of the parents.