Hello everyone! Background: I'm the daughter of a BPD mother hermit type. I found out about BPD about two years ago and since then I have been moving forward (and backwards at some points

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My grandfather (father of my BPD mother) has just passed away.
My relationship with him was not close mostly because of all the manipulative behaviours from my mother and my grandmother. All this craziness, lies... .made me numb to feel love in my mother's family side since I was little. It's not like I was ever angry at him, simply when I grew up I realised I didn't feel like other people do towards their grandparents.
These last years I barely visited him and my grandmother because I felt fake, pretending to be normal family when they all knew about my mother's inestability and nobody ever had a conversation with me about it or helped me when I was little. They were there just to pretend they were family in "family events". They don't really know me, what I like, how is my personality. If I had a problem I wouldnt think of them for help. I don't feel resentful about this, and I always had the best wishes for them, but I stopped visiting as it was time to move on for me and stopped pretending. I never explained them the reasons of my distance because they were old people and I didn't think at this point it would do any good and they never asked.
For some of the above I have mixed feelings, maybe I should have talked to him, maybe I should have visited more... .
Tomorrow the funeral is the
first time since I know about BPD that I have a family meeting. I've been behaving cordially since then with family members, because I have nothing against them but I don't feel confortable with them (for the same reasons I stated before, pretending to be family when we are not). I don't know how to behave because it is not the time and place to set boundaries but I feel so uncomfortable if they hug me, tell me where to sit, what to say and what to do (they always do that)... .They don't know I'm low contact with my mother, and my mother will want to behave as if everything is ok between us.
Also I worry I'm going to the funeral just to avoid conflict. I'm not religious and although I'm determined to honour my grandfother I think it would be nicer if I just did some gesture on my own, not just to expose to the family. I'm not sure of the reasons of going.
I would apreciate some advice about how to behave in the funeral, I don't want to create conflicts but neither I wan't to feel like I'm engaging or participating in their BPD behaviours.
Another worry is that my grandmother is going to live with my parents.My grandmother (emocionally unstable and attention seeker) and my mother have a very dependent and unstable relationship. Not healthy but they are adults and I respect it. My huge worry is that my cat lives with them because I couldn't find a flat I could afford that allow cats (I'm a student living on my savings so Im sharing flat). I worry about my grandmother leaving windows open. I know it seems exaggerated and I feel even bad about posting about it when other people have huge problems but I'm responsible for this cat and I love her so much I really suffer. My cat was so important for me in recovering. I have just signed the new flat contract for another year so I can't change now. I will be worried everyday and won't be able to sleep I'm sure.
Just wanted to share this thoughts in a safe place. Thank you so much for reading