My youngish neighbor (maybe 30yo now) once told me about how she and her sister gave her parents so many problems growing up...sneaking in boys and having sex with them while the other sister stood guard at the door. Having parties when the parents were gone. Skinny dipping in the backyard with boys. One sister driving a car while the other sister was in the back messing around with a boy, then the other sister would drive so the first sister could mess around with boys. The list goes on.
But I had never met my neighbor's sister. Until yesterday. The sister is a few years older but much less mature. They look similar overall except my neighbor is super slender with huge boobs, and her sister is normal (but still slender-ish) with tiny boobs. Same face and same long blonde hair.
Anyway, it was super fun to be talking to the sister for the first time while knowing a lot of the things she did in her past yet she has no clue that I know.