Feelings

I feel like my Mom is stressed (she does not show it) over the fact that Grandma only cares about Uncle. Despite all her work to caring for Grandma ~ paying for her utilities, buying her food, assisting her to the doctor, all the things a good daughter can do ~ Grandma only thinks about Uncle.
Uncle served time for drug pushing and using 1 or 2 years back . Grandma bailed him out and has been living with Grandma ever since. 
Grandma has Alzheimer's. It's not on the worse side yet but it's getting there.
Before the lock down, whenever we go out with Grandma (sans Uncle, he never goes with us), all she thinks about is what she can bring home to Uncle or wonders if Uncle has eaten or where he could have gone for the day. This upsets me. Uncle is an adult close to his 60's. He can take care of himself.
We know for a fact that Uncle is using again. His mood swings and speech indicate it very well. And living with Grandma who has Alzheimer's can get unnerving. It also does not help that he is unemployed and has no source of income. He complains about how Grandma would repetitively ask about one thing. He complains how irritating it is. He complains that he would die from high blood pressure because of living with Grandma. 
Uncle would have episodes with Grandma. Grandma would go out and come to our house, crying and bawling her eyes out. She would cry and tell about it. That Uncle has shouted at her, gnashing his teeth at her, calling her bullshit, threatening her. She would cry and when she finally stops crying, Grandma will walk out and tell us she has to get home because Uncle is alone at home.
She cannot be stopped. She would not let us keep her.
I think Grandma maybe a masochist. Or her Alzheimer's is keeping up with her.
Despite it all, Mom is there to support her. My Mom is the best person I know. I joke about how I would not be able to meet her in heaven some day. We might laugh about it but I feel it may come true.