Two adults and two kids fit in almost anything; three families sharing a villa don't. This page covers both 7-seater people carriers and 9-seater minivans, since the jump from one to the other usually matters more than the brand of either.
Seat count on the spec sheet and usable seat count with luggage aboard are often different numbers — each listing states whether the stated capacity assumes full-size suitcases or hand luggage only, which is the detail that actually determines whether everyone fits.