Just needing to rant

My in laws are driving me fucking nuts! To sum up the relationship with them, I'm good with my sister in law, brother in law, and mother in law but not my father in law. But recently I've been so irritated with them (except my sister in law, she lives far away and is cool). So we are staying for a little while in my fiances old room at his parents house so we can save up some money and buy a home... Well, this house is utterly disgusting. It looks like something off the show horders. They're all severely obese, diabetic, and do not take care of themselves whatsoever. (No judgement on overweight people, I'm commenting on their specific health. They'd be much smaller if they took care). His mom sleeps on the couch downstairs. She doesn't come upstairs, ever. The shower is upstairs. So, she doesn't shower. I haven't seen her shower, not once. She washes her hair in the bathroom sink downstairs but that's it, not her body. And let me tell you, you can smell it. Opening the front door, it immediately smells like owe and rotting flesh. And the food they eat... Oh my god. My brother in law rarely showers but at least he does shower maybe once a week or every two weeks. He can't pee in the toilet. he pees on the floor... he's older than my fiance and i. My father in law, this may sound beyond evil, but I wish he's just go away. He's stupid, mean, ignorant, and so beyond pathetic. He's only living there because he lost his job then had a massive heart attack. They aren't together. I'm the only person who cleans in the house. Mind you, the dust and dirt and slimey shit is so caked on, it's obviously been there for years. I'm pregnant and shouldn't be cleaning this shit for one but I'm sick of it. Nobody says thank you, nobody takes notice. Except my fiance of course. I buy the groceries, we sometimes go to work with them at night and help them (they deliver papers), etc. And they are so ungrateful for it all. They are lazy, gross, selfish, ungrateful, and rude. Apparently my fiance walked in on his parents talking, saying "she won't fucking do shit" and I'm the only other she in the house. They wouldn't tell my fiance what they were talking about either, so I think that's obvious. I'm the only one who does a damn thing, but I "don't do shit". I talked to my mom about it and she said it sounds like they expected me to be a damn maid. I was like yeah apparently. I'm not exactly supposed to be cleaning like that considering I'm pregnant, have asthma, and a heart condition. But I have been anyways. They also haven't asked me to do anything. My fiance told me to stop cleaning up after "their lazy fat assess" and said not to try and help people "who won't help themzelves". At first I was angry with his attitude towards his family, and now that I've been here a few weeks, I see exactly why he hates them... Not to mention they're all beyond emotional. He helped his mom cook, and he didn't open the can the way she wanted, so she threw a tantrum like a toddler, crying and all. OVER A CAN! Because he didn't do it her way... His brother said he'd kill himself and that we would be happier without him because we asked him to clean up after himself... Again, he's older than us. His dad put his fucking fist up at me once because my sister and niece were over and he thought I was going to babysit my niece... Like its so ridiculous. I'm so beyond fed up.