>>1159311Several options:
1) Get a trailer and front rack in addition to your child seats.
2a) Don't be a dimwit and manage your daily life differently so you don't have to haul all your kids and a week's worth of groceries at the same time.
2b) Don't be a dimwit and stop buying a week's worth of groceries in a single go, and instead stop every other day on the way home for smaller amounts of items (and fresher ones while you're at it).