If you and your family will not be crossing the country multiple times in long tourist trips in each one of these 7 days, than it is actually better to buy a Swiss Travel Pass Flex and just activate it, when you really need it.
For shorter trips, for exemple within the same city, it is maybe better to buy single tickets, because the 5-year-old child can travel for free anyway and for the 11-year-old child you always pay only half price or you can buy a children's day pass.
For further questions or an individual consultation please call our Railservice on +41 848 44 66 88 (0.08/min.) or from abroad also on +41 51 225 78 00.
Have a nice day. EllenvS.