I’m pretty sure that my brother has smoked pot with my parents, though I can’t think of an example occasion off the top of my head.
My parents tried to be moderately subtle about using it until I was in my mid-teens, but it wasn’t really ever a secret. They would have given me some if I had ever shown an interest, but I’m too much of a control freak to enjoy any sort of high, so the limit of my illegal drug use was one joint in college. My brother was a regular user in his teens and twenties, but we’re not close, so I have no idea if he still is. He holds down a job and pays his bills and is a nice guy - good enough for me. I have seen my mom and step-dad smoking with some of my aunts and uncles at family parties.
My mom was horrified last year when I told her that I knew she used coke. Marajuana is one thing, but she never wanted us kids to get into anything hard. They did do a pretty good job hiding that part, but everyone slips up once in awhile, and I wasn’t stupid. FYI - If my brother ever used coke, he hid it well - I’ve never seen any evidence of it. I don’t even know if he knew anything about it, but he isn’t stupid either, so probably.
On the other hand, I was drinking at home or at family events since way before I was legal. As a child, dad would often give me a little of what he was drinking, and by my early- to mid-teens I was free to ask for whatever I’d like if the adults were having something, or we were at a wedding or something. I was trusted to be sensible about it, and I never drank with my friends or got drunk until freshman year of college. There, I discovered that A. yes, being drunk qualifies as one of those non-enjoyable highs (see above), and B. whenever I get drunk, I throw up. After a few of these experiences, I decided to never get drunk again, and ever since I have been just a social drinker. I have a couple of the more tasty drinks when other people around me are drinking, and cut myself off if I start to get tipsy. Not being a terribly social person, I probably have something to drink about once every two months or so.
By the way, my husband, who comes from a fairly socially conservative family, is absolutely horrified by the casual drug use in mine. I’ve told them all, nothing but alcohol around him, and they’ve been pretty good about it.