I have lost my mind and ultimately not sure what to do.

A few years ago, my grandfather was diagnosed with Alzheimer’s & Dementia. When he was first diagnosed, he was only forgetting things every so often. Over time, he started forgetting things within 5-10 minutes after saying them. It has continued on like this, where he will tell you something & then 5 minutes later he’s telling you the same thing again. Over the last week he has lost his mind & been way more forgetful.
He woke up one day, this past week, went about it daily shenanigans & then decided to ‘confess his undying love for my adopted mom’ to my grandmother (his wife), during lunch. My mom went over later that day & he told her what he said to my gram about her & his feelings. She told him how she was in a relationship, and that obviously them being together wasn’t plausible & she honestly thought he was joking. The next day, my gram ended up in the hospital due to her pancreatitis.

Fast forward to the past couple days; I call the house to check on him, make sure he’s doing okay, and ask if he needs me to bring anything over. He reassures me that he’s okay & so on, then tells me about what happened between him, my mom & my gram. I, like my mom, thought he was joking. I told him that was gross & such. He says “I’m being serious, I’ve never felt like this before!” and goes on.

Yesterday while my gram was in the hospital, an incident happened where she ended up in the ICU. We didn’t know about it, until not that long ago. I called my grandfather to update him on the situation with my gram & he simply did not care & he made that known. He told me “she needs to come home asap because she needs to look after the house when he leaves.” When I asked where he was going he said “I’m leaving gram. I don’t love her like I used to.” And proceeds on to say that he thinks him and my mom are gonna run off into the sunset & so on. He has also felt this way towards the nurses he sees when he gets his phlebotomy’s done & a lady down the street from them.

Keep in mind; my grandparents have been married for around 40+ years, 4 beautiful children, 10 amazing grandchildren, and have never talked about divorced let alone separating. My grandmother is the one who pays the bills for their house, makes their appointments, does the grocery shopping, etc. My grandfather knows only how to operate the tv remote so he can watch NASCAR.

I’m wondering exactly what I should do. I am losing my mind. I’m a college student, work part-time & also try my best to do everything I possibly can for them. My gram, mom & I think that it’s his Alzheimer’s getting worse or acting up, but not sure. He doesn’t want to talk to his doctor, let alone like going to the hospital at all. He has had a few heart attacks & strokes, along with a triple bypass open heart surgery almost 5 years ago.

Is there someone I should be reaching out to? Should I try to call his doctor & inform him about whats going on? Should I trick him & say we’re going for ice cream, but bring him to the hospital to be evaluated? Is there a series of questions I can ask him to see how he is? Is this something we should worry about? Should my mom stay away from the house until these feelings go away or transfer to someone else? Will they ever go away?

Thank you so much in advance!