Creating a caregiving plan, how do you calculate wear and tear on your home?

Keep receipts and records.
If you have to regularly get the rugs and furniture cleaned because of the dogs, that's a cost.
If you clean up outside after her dogs, you have a right to charge for that kind of clean up too.
Housekeeping and pet care services are not free no matter where a person lives. Start charging grandma a monthly fee for housekeeping services.

Sounds like the first thing to do is to address the issue of dogs....and consider the possibility that your home cannot support (at this time) the presence of pets. Just a suggestion as a beginning to see where it leads. Good luck....

I think you can't calculate it preemptively in a fair way but maybe include a clause that says something like repairs and maintenance as needed, then you can add the cost (or a percentage of it) you paid for the work to the next invoice along with detail of what was done.

If you are determined to put a price on it then figure out the cost of repairs and divide that by the estimated time between now and when the work will be done to come up with a cost per month, which can be figured into her monthly expenses.

I think this is a lost cause, frankly.

Mother uses her walker as a battering ram and slams into doors to open them. Every door in her pathway is ruined. It used to be that we could paint them every other month and that helped--but now it's just above fixing.

The carpets and fabric furniture has been totally saturated with urine, and at some point, you simply cannot get that smell out. When she passes, her recliner and sofa will be thrown away.

Somehow she has broken all 3 faucets in her place. I don't know HOW. Like, broken from their moorings. They all leak now, and brother cannot get her to leave the apartment long enough to fix them. She is hanging over him the entire time he tries to fix things.

When she passes, he plans to gut the apartment completely, and remodel it to be a master suite for himself and his wife. Probably will need to replace the sub-floor--again--- urine spills for the last 5 years have been constant. She's now becoming bowel incontinent and has overflowed her diaper a few times.

How can you possibility put a price tag on the total destruction of a small apartment? And what would be the point? Mother doesn't pay rent, she pays the cable bill (about $200 a month) and this is her total contribution to the household. All 4 of us sibs are planning to refuse our small inheritances and give them to YB so he can have SOME measure of being made whole. We cannot give him back 25 years of unpaid care, but we can help a little.