person A: My grandma was very sick and unable to get around very easily. 
person B: I'm sorry to hear that. Is there anyone who's there to help her?
person A: No_comma_ so I decided to go stay with her so that I could take care of her until she was better.
person B: That was nice of you.  My parents did the same with my grandparents.  She's very fortunate to have you.