That would be fun, although it might cause some problems with some people new to the VV games. Imagine if they picked all five as mothers with a baby for instance! The poor things would starve to death in short order. (Unless mothers can do more things in VV4 than in earlier versions.) Or if they picked all women or all men ...

I expect an all-kids group might survive on mushrooms alone and might be able to find enough duplicate collectibles to get some extra tech points, but it would be touch-and-go.