If you are a babysitter, that is somewhat different. Where you are also makes a big difference. I live in a very small town, with small parking lots, small lines, and most of the people know each other.
My question about leaving them alone in the driveway stands. If the four year old is asleep, did you ever haul in the one year old first, leaving the four year old momentarily unattended?
Never, actually. If the four year old was asleep and the one year old wasn’t, I would park right next to the house, open the door to the house so the 7 year old could go in, unbuckle and wake up the four year old, unbuckle the one year old, let them both out of the car and into the house.