My girlfriends mother died recently and I was asked to take something over to her fathers house (age 85) to drop off. I don't think he was expecting me. There was a delay in his answering the door. When he did he looked dischelved and it little flushed. I didn't think anything of it and walked in with the delivery. The interior door to the garage was open and it seemed to me that that was where he had been. I continued on into the kitchen with him and then turned back towards the door and suddenly there was one of his other daughters (age 55). She looked at me funny and was just looking at me like a cat with a mouse. Again, it didn't hit me and I said hi and then left shortly after that.
Then I started thinking about and I remebered hearing that there was some tension between this particular daughter (there are 6 others in the family)and her mother. My gut is telling me that they were having sex but I find that hard to believe. Does this occur and should I tell my girlfriend?