Don't get me wrong, they don't swear, but often use words like Flid, Heifer lump, Stupid, Shutup, Fat, etc.
Everytime they do I make a big fuss about how I do not want my dd repeating such words, but it makes little to no difference.
I've even tried to use the, "How embarrassing will it be if she repeated this at nursery" argument, but again, doesn't seem to make much difference.
In case you're wondering, not my parents, they'd be horrified if they heard anyone speak like this. And no I don't think they're very nice people either.
Then again maybe I'm just a bit prudish.