My dad told me how he smoked a lot when he was a teenager at school, while cautioning me not to do the same. He also told me how he used to frighten his parents by climbing on roofs, and so on. (I think he only told me the ones he thought I wouldn’t try myself.)
My mum also told me about serious disagreements she had with her parents, but not until long after they were dead, and I was about thirty.