My mom had the same thing happened. I stayed with her the 1st week. My grandfather did not understand why she couldn't let my uncle and his son stay with her the day after surgery. He expected her to make 2 meals a day for 6 people. Then, thought I would.... She said no, I was there to help her not play maid.
My step dad gave her a hard time for several weeks after. Family sucks sometimes.
She is lucky to have you to help her.