She's 80 and I think mentally has gone down hill in the last six months. She keeps talking about sex very inappropriately in front of my DD's (6), which so far has gone over their head, and is a bit cringeworthy for me, bless her . A recent example, in a crowded restaurant:
I was talking about our forthcoming holiday to Sardinia and asked the girls if they remembered what the local delicacy was. I'll give you a clue, it begins with "S", I said.
Blank faces all round, until mum shouts out
"IS IT DICK DARLING" followed by deep guffaws of laughter (hers!).
"Muuuuum", I hissed "No, it's bloody donkey".