Should I move in with my grandmother and become her caretaker?

I recently sold my home in NY with the intention of moving to FL. I began having second thoughts about the move a while ago and thought about buying another condo here in NY.

For years my aunt has lived with my 90 year old grandmother but recently decided to move away (to Florida ironically). Grandma needs someone to live with her, prepare her meals, help her with daily tasks etc. I love my grandmother very much but she and I do not have the closest relationship. She can be very mean and her cantankerous personality has only gotten worse with age.

Grandma owns and lives in her own condo here in NY (on the beach BTW). My other 3 aunts and my mother do not know what they will do about her care. We don't believe in nursing homes but there might not be any other alternative unless I move in with grandma and become her caretaker. And of course I get to keep the condo on the beach when she passes away. I am not sure what to do. I love my grandmother but living with her will not be easy. However I am retired so I have the availability and I just sold my home and haven't purchased another yet so the timing is uncanny! What would you do? Would you move in with and care for your ornery 90 year old grandmother?