AITA for not visiting my grandmother in her retirement home?

TLDR: Said my goodbyes to my grandmother a couple of years ago, she pulled through miraculously and is now in a retirement home. Due to a strained relationship I think me visiting will barely mean anything.

Hey all, sorry for the long story and for any spelling/grammar mistakes (not a native speaker).

I've (27m) never had a great relationship with my grandmother. I think I've seen her a total of 10 times in the last 20 year. Her and my mom never got along well, and my father isn't one to see his family a lot (sometimes it would even be years where I would not see his side of the family, even though my mom said he should contact them). 

About 9 years ago I broke off contact with my father (not important why, but I was mostly TA there for placing most of the blame of my parent's divorce on him).

6 years later, my grandmother (his mother) was hospitalized and we were almost certain she wouldn't get out of the hospital alive. I was kinda shocked when my dad called me with the news, especially since we didn't get along that well yet. Anyway, I made arrangements with my brother to visit my grandmother &amp; father. We said our goodbyes (wasn't anything emotional, but she was happy we were there). Eventually my grandmother did get better and got out of the hospital and could even live on her own.

Last year she surprisingly showed up at my brother's wedding, but she was notably older and dementing. She kept confusing me and my brother and kept saying how happy she was for me and how beautiful my girlfriend was. I tried to correct her a couple of times, but eventually gave up and went along with it and so did my gf. It was very awkward for me, even though I realize it was mostly her dementia.

Fast forward to a couple of weeks ago. She was hospitalized again, this time even more serious. She still came out of there alive, but could certainly not take care of herself anymore. My father and aunts decided that it would be better for her to live in a retirement home. Her dementia is now even worse, so on some days she doesn't remember what happened and it takes some time for her to understand what's happening. He did notice that she was visibly more alive when people came and visited her.

This (finally) brings me to my current problem. On the one hand, I don't feel the need to visit her. I don't have a great connection with her, nor with my father. I also felt like the first goodbye was a nice closure, for me at least, and the wedding was a nice bonus. I also doubt she would recognize me or remember me the next day.

On the other hand I feel bad, since it is my father's mother. Now, the relationship of me and my father is slowly getting better, but still not how it should be between a father and a son. Me visiting her would maybe not mean much to me, but it could prolong her life/make it a bit nicer, and would be a nice gesture towards my dad.

Soo WIBTA here?

Yaay, you made it to the end. Thanks for reading!