HELP PLEASE ASAP! In-law Interference wrecking relationship

I am 35 year old woman in a relationship for the last 3 years. We've lived together and also have children. Several months ago we went through a pretty rough patch and were forced to move in with my mother and step father. Since then it's gone down hill and anytime we have a personal disagreement my mother always gets involved and for the last few weeks she has decided that my boyfriend is no longer allowed to be on our property at all. He has a child, our child who lives with us here. All his belongings are here and this is where he has resided for the past several months since we moved out of our own home. I'm having trouble taking advice from my mother who sleeps all day, does no housework ever and does not fulfill her own duties as a wife. My parents are retired and my poor step father washes his own clothes, fixes his own meals and between he and I both we try to take care of all the duties of keeping the house clean and things like that with no help from my mother. My boyfriend helped when he was here also. My mother doesn't even help me if something needs to be done, she won't even tend to my children in order for me to do anything like mow the yard, etc. I have my children all times and she doesn't ever offer to let me get out and have any adult time not even on any weekends. I need advice.