My family and DH's family are all pretty free and easy with things like this. In my family, I'm one of two girls, I don't think it was until my sister and I were in the midst of hormonal teenage girl craziness that my Mum and Dad were a bit more discreet about things. Now, it's not like we all parade around in the nude all the time or anything (it's too cold atm anyway) but we'd get dressed and undressed infront of each other, go in and out of the bathroom etc. And by all of us I mean in my immediate family (the four of us) and in both our extended families, both mine and DH's Mum and Dad and our siblings. Like I know I've seen my MIL in her bra, but yeah I guess I wouldn't walk in on my FIL while he was on the toilet??? Sorry, totally rambling now... hmmm... I dunno it's just not a big deal with us??? Sorry I probably haven't been any help.