Honestly, not looking for advice. Just need to vent.
Some background, my DH (31) and I (31) moved in with his parents(61F, 57M) (renting) a few years ago to help them save up then we were going to leave and buy our house. Keep in mind they can't afford rent without us.
MIL recently put herself in debt more than what she makes in a year, didn't tell any of us, not even FIL until it was well over what she makes. We found out bc we were talking about moving out and she became very avoidant. She finally told us and filed for bankruptcy. DH and I were both pissed, but didn't say anything because obviously she was stressed enough.
This was a less than a year ago, flash forward to now and SIL(40) is living with us (again, leaves her BD like twice a year then goes back to him and blames others for it). DH has already complained to MIL numerous times. Her response is always "she's my daughter, I can't etc."
We're not allowed to have guest stay for more than 2 weeks at a time or a total of one month per year. We also need to notify the property manager if we have guest staying over a week. Has MIL ever said anything? No.
I would be okay with it but SIL and I had a falling out a couple years back when she blamed me (through text) for her going back to her BD (DH and i pay for an extra room to work/game in since we have opposite work/sleep schedules and she wanted the room but didn't ask us only complained to MIL who told her to ask us), told me I was the worst person to marry into the family, cursed MIL out. All while I was grieving my grandfather who had just passed that week, was taking my TPAs, and navigating the end of the year as a new teacher. DH told her off but MIL never told FIL what happened bc she didn't want him to get mad at SIL (not her bio dad). SIL has this pattern and when I asked MIL if she apologized to her after cursing her out this time MIL said she didn't want to ask for an apology bc she would be the one who ended up apologizing.
DH knows MIL is enabling her. He's fine with leaving (we're starting the homebuying process next week) and I know that once we leave he probably won't have a relationship with them anymore (before we lived with them I was the one going over to see them every other week). It's sad but honestly now I understand why he rarely went to see his parents or siblings (doesn't talk to his brother).