My father thinks I'm his girlfriend! Anybody in a similar situation have advice for me?

Omg! Last night after he had been sleeping for about two hours he got up to use the br. He was in there longer then usual so I asked him if he needed help. He said he had a mess in there and was cleaning up. I waited and knew that I'd have to go in afterwards to re-clean. He came out of the br and I was waiting in the hallway to escort him back to his room when he asked for a hug. I went to give him a quick hug and he pulled me close and grabbed my behind! I was flabbergasted! I didn't make much of it and got him resettled in bed. I did say "I'm your daughter" I didn't sleep too well afterwards thinking he might find his way into my bedroom. He's 92! Jeeze! I know his reasoning and memory have flown out the window for sometime now but this really took me by surprise. I'm hoping this is just a one time event. Anybody with a similar situation and advice for me? I'm so glad I found this site where there are others that can relate and know exactly what I'm going through and don't judge! Thanks for any advice!