AITAH for not going to my grandmothers house?

(English is not my first language, and I have dyslexia sorry for potential bad grammar or misspellings)

I’ll start with a little bit of context. My bond with my grandmother is not the best, the same for my little brother and mom. My grandma has done some stuff in the past to them that made them feel like this about her, however I was always her favorite and as a kid I also really liked her. However as I got older I started to see that she’s really narcissistic, especially towards my dad (her son).

So there’s this banging noise she hears in the house which no one else can hear, the police has come for it multiple times but there is literally no noise. She also says the noise is making her vibrate on her furniture, which we also don’t feel. This has been going on for years now. She calls us up, saying she wants to end her live, we come to her, she is crying threatening that she’s going to end it or that she’s really not feeling well because of it and needs to go to the hospital. She also has a history of mental illness, we all think the noise is in her head. She has been at a mental institution before, but I was so young I barely remember it and I don’t remember why she was there. She has been to the doctor for it, who recommended her going to see her psychiatrist but she refuses saying she isn’t crazy and it isn’t in her head.

So I (15/16 years at the time) have always held her hand, just being there for her, but at a certain point it also became too much for me, since I was depressed at the time. So at a certain point my therapist told me it’s better for me to not go when she calls us up like that. However I did still go to her house for normal visits when she wasn’t hearing the noise.

She also made life very hard for us, about a year ago my granddad got dementia and couldn’t live at home anymore. They got liable for a beautiful apartment in a care facility really close to their home, but my grandmother refused saying “she’d still be stuck with him” her literal words. So my grandad moved out alone to receive the care he needed, and she stayed behind, suddenly being all sad and alone even though she visited him 2 times a day. So lately she has kept saying stuff like “I want to move” and then we’d set things up for her and she’d crawl back saying she doesn’t want to move. And she’d do that like almost every month.

So a few days ago my grandmother called my dad again, saying she wasn’t feeling well, crying about the noise, the usual. My dad asked us all who was going with him I (now 19) said no, just like my brother and mom. I feel like he expected me to say yes, because that’s what I always used to do. But then he started to get quiet and annoyed, my mom asked what was wrong and he started ranting about how he was all alone in this. I explained why I didn’t want to go, and that he shouldn’t forget how I was always there for her, holding her and helping her. But now that I’m choosing for myself he gets mad at me.

So I want to know, AITAH?