Is AUTHOR wrong in the post ? POST : Obligatory first time posting warning.

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Over the past few years whenever I go to my maternal grandparents for Christmas or easter or whatever I notice things that my grandmother does that are making me dislike her more and more. However i can't stop feeling bad about it because she is my grandmother after all and she is wheelchair bound

The first main thing is the way she treats my mother (her daughter-in-law), her daughter, me and her husband. She constantly relies on my mothers kindness to buy her movies, as all she does is watch movies from the 90s, and organize most of her care and helpers. And while my mom does this she constantly criticizes her for being too slow, getting the wrong kind, not spending more money or not calling her more often. It seems like we talk to her she has something to complain about. But the way she treats her daughter is even worse.

My aunt has been going through some marriage troubles because her husband is an atheist while she is a catholic as my grandfather is a Irish immigrant and all of their kids are beginning to go into high school so she feels like she needs to be there for them. And because she is the closest to my grandmother she often takes the brunt of her complaining and my grandmother has started to laugh at her because of her marriage troubles.

The way she treats the men in our family isn't much better. My grandfather is a very nice man, he supports the things I am doing and still frequently talks to my father. He is in amazing shape for an 80 year old and still often runs and plays golf with his friends. But she often yells at him because his cooking is wrong, he bought the wrong things for her, he is too slow and he is gone too often. My father has cut ties with her as he doesn't want to deal with it but I share the same fate as my mother. I am a Sophomore in high school (grade 10 for those who are not from the US) and I am trying to become a pilot, I have already started private pilot training. But my grandmother criticizes me as being too dumb for a pilot even though I am a mostly straight A student and I am fluent in mandarin. And she also makes fun of my weight, I am a somewhat scrawny kid but I do have a small beer belly that I am quickly getting rid of by dieting and exercise. She also neglects her grandchildren as she never gives us anything for graduations, birthdays or christmas; my grandfather does all of that.

As I witness and experience all of these things I dislike her more and more but I still think I should at least tolerate her because she is my only living grandmother, disabled and is on the side of the family I most identify with.

TLDR: I really dislike my grandmother for being a terrible person to everyone she knows but I think I should tolerate her because she is my grandmother and disabled. 