How do I even get along with future mother in law?

[blaeey]

I am that type of person who tries to get along with everybody. But this woman is driving me nuts.
My boyfriend is a great guy and even though he is a 37 year old single dad who is dealing with a potentially life threatening illness, I decided to stand by him. However, he is currently living with his parents right now because his parents have to take care of him. Well, although this is understandable, this situation is making everybody's lives more difficult.
His mother is very very paranoid. For example, she inspects everything that I made for him, and she is overbeating and super critical. I mean I understand she worries about and loves her son, but she can always choose her words nicely.
When I first met her, I was helping my boyfriend filling out his medical form, there was one section asking him about his medical history which I was not very aware of, so I asked my boyfriend to fill out the part himself. I heard his mother said, "Let her do it. you need to rest."

Am I not a person? Am I a slave? I know his mother loves her son, but she should at least treats me with respect and some kind of compassion. She said I am a wonderful person and did not know what she did to offend me. In the hospital, my overcoat has fallen off chair twice in front of her feet, she never bothered to pick it up even once. Everything I cook is wrong in her eyes and she had no problems criticizing me in front of her whole family. I feel I am a slave, and couldn't breath.

My boyfriend will have to live with his parents for a very long time. On top of dealing with his illness, I have to put up with his parents, and his daughter's bio mother is a wacko as well, what am I going to do?
I am not about to bail out on my boyfriend, just need some very practical advices.

Thank you in advance.

[lundie]

just dont live with them