Okay basically...
Vegeta, Future Trunks, Trunks, Bulma
...against ...
Goku, Chichi, Gohan, Goten
It's a 4 on 4, but wait a sec...
it's not just about purely battling but the characters are allowed to use their knowledge and build weapons and etc. ^__~ (o.e: Bulma building all sorts of crazy stuff).
Which family would win? XD