<human>: First off, this is the only time I have ever posted, as I am a little new to Reddit. I apologize if this is long or if I cannot figure out how to reply right away.

My husband and I are both 25, and we have two kids (5f and 3m). We live in a decent sized house and both work full-time. I work second shift m-f and he works first shift twelve hours on a rotating schedule. He works two days on two days off, so some days we need a sitter for the overlap. I have two sitters, one to pick up my daughter from school, one to watch my son. This is just how it worked out as we are in the country and the sitters are in town.

My mother in law is on workers compensation for an injury that is taking a  long time to heal. Her apartment is a terrible place, and her youngest son (9m) lives with her. She has two dogs and two cats. She also has COPD and her basement has mold in it. The mold is so bad you can smell it when you walk in the front door. She spends most of the day coughing because of this. Her landlord lives on the other side of the duplex and refuses to fix her water heater or doing anything for her because she is behind on rent since she can't work.

She has proposed moving in with us and paying us $250 month and being our sitter for her grandkids. While this seems like a good trade off, I am afraid it will not work. Living with her in the past put a lot of strain on our marriage, and I'm not sure I want to go through it again. I know this would be a better place for her and her youngest son to live than where she is at though. I also know a lot of families move their parents in to help out with costs and such. 

I was also recently unemployed and our bills have mounted up over the summer. We could really use the extra money from not paying a sitter, even if she doesn't pay us. We would save about $350 from the sitters.

I just want to know what other people think of the situation, and what they would do.

Summarize the given text in a few sentences.
<bot>: MIL wants to move in with 9yr old son, offers to babysit and pay $250. Lived with her in the past and almost split with my husband. Should I take on the stress again?