Damn, dude. Family tension isn't what you really want to incur during the summer break.
I thought I had it bad (my shit broke again..) but yeah.
Personally, my grandmother had Alzheimers too and the first two years I felt so bad for her, and I spent so much time with her. Then it got really sad when she had to ask me who I was every time I went to visit her. If she means anything to you, spending time with her might not be bad. Old people are old people, and the possibility of them passing on is at its highest. My grandmother died in her hospital bed the week she forgot what food was and how to eat it. I was lucky enough to remind her who I was before she passed.
No bullshit. I bawled hard, man.
I know I can't anything from behind my computer screen except perhaps console or sympathize you, so I'm hoping everything gets resolved peacefully.
We be bros forever.
Best of luck with your fam Nick