My grandfather (moms dad) flipped over my grandmothers Camaro when they were teenagers in the 60s
My grandmother (dads mom) accidently got her family drunk when she was younger and made sukiyaki at a family gathering. Someone had told her to try freezing the saki she was using, and it made it way more potent.
My grandfather (dads dad) used to have to do some work with people in the soviet union in the 80s and 90s around the time it collapsed. He's mentioned some of the crazy stuff happening around that time, like people stealing light bulbs from parks to trade in for spares in addition to their lightbulb rations, or having to sneak money in in very creative ways to get it to people.
My grandmother (dads mom again) lived in New York city as a little girl and she remembers when she was 6 and New York had their biggest snowfall (to this day) in 1947. She says she remembers that the first floors of buildings were completely beneath the surface.
My grandfather (moms dad again) stuck his tongue to a frozen pole as a kid. He said it hurt but didn't stick.
My grandfather (dads dad again) used to be an oceanographer for the US navy and always has interesting stories about the stuff he did.
Both of my dads parents saw Jackie Robinson play at the first baseball games they went to as kids.
My dads parents also both went to president Kennedy's open casket memorial service. He was assassinated less than a week after they got married.