How can I figure out how much to be compensated for my hours spent caring for my mother-in-law, who has Alzheimer's?

My mother in-law who suffers from Alzheimer's is about to move in with us. Instead of working outside of the house I will be taking care of her full-time. She does not qualify for Medicaid due to her finances being to high. How do I fugure out what I should be compensated for my time as her full-time caretaker? We live in California and I have done all kinds of research and have found a few companies that I can hire for in-home care but it's an hourly wage and I would not know how many hours to add for myself due to the fact that it is a 24/7 job. Please help me figure this out I want to be very fair to her and to myself.