This is a great topic.
My dad's first car was a hand-me-down Pontiac Acadian / Chevette.
He drove that for a few years before it eventually overheated and died. I think he had that from the mid to late 80's to early 90s. He might have had a Dodge Aries or something shortly after.
When I was born in 93, my dad bought his first new car in Canada and thus, our first family car - a 1993 Toyota Corolla DX in what my dad calls to this day "champagne".
One of my only memory of that car was when I opened the door on the highway to see what would happen and my parents freaking out

I have no idea if it had child locks or if my parents even knew what they were. That car ended up getting written off in 2001 in an accident that almost killed our family when a merging van hit us and spun us into the guard rail on the old Willingdon bridge over HWY1. I remember seeing the front 1/3 of our car hanging over the bridge after emergency crews got us out.