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sounds like your kids are young,
and with 4 you probably often have one or two with you

when my 2 were young I would park near the cart return, I would unload the cart, the baby would stay in the cart, as the older one began to walk along side she was taught to keep a hand on the cart, and keep an eye on her baby brother in the cart. After my cart was unloaded, I'd take it to the return, which was often just next to the car, then I'd put the kids in the car. The kids were always in my arms or holding my hands. (my friends with more than 2 taught the older ones to hold on the outside) My eyes were constantly moving.