Booking a Party over 5 on trains?

In Germany and Italy there are 6 of us. The sights only allow a booking up to 5 people. On Bahn it won't allow the 6 of us as a group since the kids are only half but it won't let us do all the regular ticket. Argh! Who should we book separately? My self, my husband, my 17 yo, my 13 yo, my 11 yo, and my 10 yo. I was thinking the 17 year old as we can all get a family rate and she can then get a youth rate. Any experts on this?

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