Seatbelts????
My folks had 8 kids and I was the youngest so I had (actually got to ride) to ride on the deck behind the back seat next to the rear window! All my brothers and sisters were crammed in the front seat between my folks or in the back seat!
When I was a kid, there were no seatbelts in the back seats of cars. Couldn’t have used them if we wanted to (and we didn’t want to)