I have two very good friends who each have 4 children. I and my children love spending time with them (normally separately as they don't really know each other) and we always have a good laugh. However, it's gradually dawned on me as our children get older that both these families have lots of "in" jokes about other people - nicknames etc - and they will laugh about them in a way that makes me feel a bit uncomfortable (and mortified that behind closed doors they might be doing the same about us!). I have to say it's not malicious (mostly) but it's very unfamiliar to me as my own family when I was young didn't do this at all.
What do you think? Do you do this with your kids?
More than happy to be told this is quite normal btw!