Posting for traffic and name changed.
More of a what would you do and not sure if this is an issue or not really but am a bit 
My mum babysat last night and told me today that my two daughters who are 11 and 9 told her a "funny" story about their dad sitting on his willy. My first response was how on earth could he do that but she said they had both told her, using their hands to demonstrate, how big it was. As in holding their hands so far apart and saying, "It's this big!" They have grossly exaggerated that bit
but I find it a bit odd that they have seen it because he was always so careful not to allow that to happen. We have been separated for many years now but right from them being babies he would ensure they never saw his genitals and even wore shorts if he had a bath with them. Due to that I'm a little worried that they are now older and have obviously seen it. I haven't been able to ask them about this as they are at his this weekend. I can't ask him about it as we are pretty much NC due to him being abusive to me both during our relationship and since we split up and he is a pathological liar.
Am I worrying for nothing (am a bit PMT ish at the moment) or should I be concerned and what would you do?