scaredy, just tuck a couple of beach towels in the seats and tell your kids they can ride in the old car on the next road trip with their bare feet hanging out the windows.
And carry a pan with you to put under it when you park it so as to not mess up the friend or relative’s driveway whom you’re staying with :=0
And don’t forget to carry extra fluids, incl a few gallons of water for the radiator!!