AITA for getting annoyed at my partner and SIL after she told us to babysit?

I (26F) and my partner (31M) have jobs, mine requires me to work graveyard shifts (so nighttime to 6am, at a motel) i have around 6 hours sleep a day and the weekend i catch up on my sleep or craft projects. Today i woke up from a text from my partner, saying we have to babysit, i was so excited for my chill weekend at home. I was kind of annoyed and told him i was.

his sister dumped her kid here, even though i didn't want to. I stayed inside and did my own thing, while i made my partner babysit (since he said “yes” and i didn't, i didn't feel obligated to). He didn't watch the kid and he almost ran out our front gate, then the police came by and did a welfare check.

around an hour or so ago, his sister came back drunk out of her head. I thought that she was back to pick him up (oh boy, i was wrong), she scream drunk our house down. I kinda wanted her to go, then she said “okay, im going” pushed her kid back inside. My partner asked what she was doing and she said “im going to the pub”, he was livid. Her kid was bawling heap on the floor, then he was banging at the front door, screaming for his mom.

but they locked the door and she went off, i was shocked. My partner was red and angry, he yelled the house down, calling her a Slt and other names and said “im not doing this crap again. We were only supposed to watch him for the day, not have him overnight. I work all the time and everyone thinks we are a fking daycare”. I could see why he was livid, i work too, im a housekeeper at work and unmarried housewife at home. I have no kids and im not a daycare, i never get help with anything and his sisters trash my house and leave and not help me with anything.

i told him im going away the following weekend, i planned a weekend to my grandmas farm to spend the weekend with her and not to come or contact me. He was shocked, but im sick of being treated like this. Am i in the wrong? I kinda feel bad, but im so pissed

AITA for getting annoyed at my partner and SIL after she told us to babysit?
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