ugh His family is killing our relationship

Last year, me and husband have our own place, with our son and our doggies, everything was so good unit my own dad stole money from us, we had to move out cause we couldn't  afford the place we're living anymore. My husband's dad help us out, letting us stay that his house. I think it was bad idea cause I don't get along his mom or older sister. But we didn't have a Choice, couple months being at my husband dad house, I seen things I would called the cops or child services (i think that how spell that). His older sister have two kids age of 3 and 2. All she give them for food is milk, that's it, their outfits don't fit them, it real tight on them. My husband mom always take care of them while his older sister all she does is go to work, earn money, send it in unless toys and beer.  Me and him mind our business, then his mom start fights with us for no reason, telling us we can't cook, we can't do our laundry, and can't be downstairs, I have a two year old, my husband fights with this own mom, yelling at her why can't I feed my own kid. Then I hear his mom and older sister talking shit, saying we're bad parents, not letting our son play with her kids and not feeding him.  I'm upset to the point I can't handle this anymore. When the holidays came, his older brother came to visit, my husband was so happy to see him. I been spending more time with my mom during the holidays, making food for my son at her house, then my husband starts a fight with me, saying I don't do shit, I don't play or give attention to our son. I don't feed him or anything. I cry so much, then I find out his mom and older sister were talking shit about me nothing but lies. Later his older sister made pizza aka put it in the oven pizza, I didn't eat it, (I don't like frozen meals) I don't mind my son eating it, couple of hours past, my son won't stop throwing up and pooping. His body was so hot, he wouldn't stop crying. I drive to his doctor with my mom. He told us he got food poisoning. I told my husband what happening lately, today we both got jobs trying to earn money to move out, we both talk to each other, not to let his mom or sister trick us (mostly him cause I don't talk to them.)  It very hard when both of them want to know what we're doing, literally putting their face so close to us, trying to butt in our life's.