My grandfather has experienced a few strokes and as a result has been slowly losing it. His memory is poor and he often asks the same questions and tells the same stories multiple times per day. My grandmother [70s F] takes care of him and shuttles him to various appointments. He can still sort of take care of himself, with reminders.

Every year my grandparents winter in Florida, and they headed there about a week ago. My mother and I were at their house helping them load up their van and saying goodbye. While I was there my grandfather asked me to sit next to him on the couch, and he did this sort of weak back rub thing as I was sitting next to him (not unusual, he has always done this. But then he sort of did this reach around thing and grabbed my breast (I don't really like to wear bras, and he knows this since some guys who work for the construction company he owns have commented to each other about it in his presence). I was kind of in shock so I didn't say anything, but he got a handful. 

I told my mom but she just laughed. I don't want to be uncomfortable around him but isn't it a little weird/gross? Should I tell my grandmother? I figure if he's losing it so much that he felt his granddaughter up, he should be getting more help than my grandmother can provide.
user
Grandfather grabbed my breast, don't know if I should tell my grandmother.
assistant
My grandfather has experienced a few strokes and as a result has been slowly losing it. His memory is poor and he often asks the same questions and tells the same stories multiple times per day. My grandmother [70s F] takes care of him and shuttles him to various appointments. He can still sort of take care of himself, with reminders.

Every year my grandparents winter in Florida, and they headed there about a week ago. My mother and I were at their house helping them load up their van and saying goodbye. While I was there my grandfather asked me to sit next to him on the couch, and he did this sort of weak back rub thing as I was sitting next to him (not unusual, he has always done this. But then he sort of did this reach around thing and grabbed my breast (I don't really like to wear bras, and he knows this since some guys who work for the construction company he owns have commented to each other about it in his presence). I was kind of in shock so I didn't say anything, but he got a handful. 

I told my mom but she just laughed. I don't want to be uncomfortable around him but isn't it a little weird/gross? Should I tell my grandmother? I figure if he's losing it so much that he felt his granddaughter up, he should be getting more help than my grandmother can provide.
user
Grandfather is losing a lot of memory and is now getting groped by my mom and I while in Florida. He has experienced stroke before and has
assistant