Well I had to do this with my Mom when she was sick and there is no simple answer.
When another family member yelled at me about something, I told them to fuck off since I'm doing the work. If they want it there way, then they should stay home. You are doing it the only way you know how to and they should appreciate that.
And when your Mom yells at you, just ignore it. It is REALLY hard to do, but I'm sure she isn't in her right mind, so don't take it personal. If you feel like yelling, just walk away, get yourself together, and come back.
Or you could just listen to FM.