Hi @Sameera
Thank you for your request.
It depends where you live and which tickets you want to buy (Swiss or international). You can buy tickets under the following link : https://www.sbb.ch/en/home.html
If you live in Switzerland: For children, our Junior Card can be interesting. For CHF 30.00 per year/child, children travel free with their parents. Otherwise there is also the Day Pass Children
If you live abroad and buy a Swiss Travel System product, you will receive for free Swiss Family Card.
In order to be better informed about the ticket you wish to buy, I advise you to call us. you can use the phone number +41 848 44 66 88. If you are calling from abroad and this number doesn't work, please try +41 51 225 78 00.
I wish you a good weekend.
Best regards
NicolasK
