My two siblings could not help monetarily or physically for various reasons when my mom moved in with us.
Things weren't too bad until she turned 90, and her needs started increasing. My husband worked two jobs so I could stay home with her. I finally hired a part-time caregiver because of my stress and fatigue.
I often thought, well, it won't get bad enough where I'm doing (insert medical things here that I'd never thought I'd be doing). But I always did and got used to it. Her caregiver was instrumental in surviving it all, as was my husband.
I learned that self-care is essential. Get out on a walk or in nature as much as you can. Consider hiring someone, even if they are part-time once a week. I wore myself to a frazzle and was on the verge of taking out a second mortgage and looking for the best facility I could find: migraines, digestion issues, back issues - much of it from stress. Most could have been avoided if I had taken better care of myself.
Despite all that, I felt honored that we could care for her here at home. She died peacefully, in the room I now write in, at 95 in November 2023.