Elderly siblings treated me badly

[Happinessislife]

AIBU to want to tell my elderly, frail siblings how I feel?
I'm seventh of eight. Three of us born disabled. A complex, dysfunctional group raised by very living parents who have both passed on.
We lost one disabled DS. Our two disabled DBs still need help.
When our parents died over a decade ago, 3 of my siblings took (stole) responsibility and completely blocked me from involvement. My pleas to let me be involved fell on deaf ears. I've dealt with a lot in life but this was the hardest and cruellest.
They controlled my DBs lives and they let them suffer. Lacked responsibility.
Eventually they became bored of the pressure of trusteeship and one DB went into care.
They don't visit or contact him now. He's not welcomed at the family house. I feel so angry.
Because I don't show my feelings there's a sense of calm between us. Christmas cards, pleasantries etc. But I'm still so upset.
AIBU to want to tell them how I feel?
They're elderly and frail. Their children are my age and I'm friends with them. I look after my nephews and nieces children and love them.
Do I let this all become water under the bridge?

*"Loving parents" . ...not "Living parents"

You're not unreasonable to want to tell them but you would be to do so. What is it you hope to achieve by letting them know how you feel?

You're right of course. What would I achieve. One of my D'S is determined to keep the family house running. She and her DD run things so that only one brother lives in a five bed house. My DB has no life. He has no future and I'm afraid he'll also go into care when they run out of steam. But I feel doubtful I can change that. So yes, you're right, I'd achieve nothing really.

Complicated. One brother left in the family home but things aren't great for him. I'm worried he'll end up in care like my other brother. But I have no say, so I'm not able to make suggestions.
I do feel angry. But also aware that it won't help to make a fuss