Opinions...? Sorry if this is long..

So my husband just got out of the military and we had to move to a different state to where his family is and we are in the process of buying a house. We are living with his grandma and her alcoholic crazy boyfriend who she said she was going to kick out. She even had my husbands mom get restraining order paperwork because shes law enforcement. He’s absolutely insane. Constantly drunk. Got fired from his job because he went there completely wasted. He smokes in the house all the time at night and the entire house fills with smoke. We have a baby and we’ve told him to please not smoke in the house multiple times. My husband has asthma and we had to leave because my husband had a asthma attack at 3 AM because the house was filled with cigarette smoke. Anyways, we basically are confined to a bedroom and our one year old is sleeping in a closet. His grandma gave us one shelf in the refrigerator and no room in the freezer. And she gave us one shelf in the pantry to keep our food. She wants us to pay half of her rent because she can’t afford it because she doesn’t have a job and her boyfriend got fired. Do you think half the rent is fair for what we’re allowed here. Also, we have a dog and he’s not allowed into the whole house. He’s an inside dog usually and they make him stay outside most of the time and it’s SOOO hot outside and then only let him in the kitchen and he cries all the time because he wants to be with us like he used to be. :( And they also get irritated when my daughter cries. I just don’t think half the rent is fair. Opinions?