Yeah I can just see it now. Family decide to go to the beach for a picnic. Mum gets on the bar of the bike, kids in a trailer on the back Picnic table on the rear carrier.
At the beach Dad's to knackered to play with the kids besides he has to keep his strength up because he still has to 'double' the wife on the bar and tow the kids back home.(hoping that he has enough battery left)
Not going to happen
If they all have e-bikes, a family ride to the beach sounds lovely! Four new e-bikes can be purchased for way less than one new car.