I need help, fil drinking while watching my daughter

Okay so this whole situation has been fucked up and its been eating at me. My partner and I sold our house, due to financial reasons such as him racking up debt and not being able to afford the house and paying off credit cards ect. We applied to have this debt removed and added to our mortgage as we've paid over half off since we've purchased the house and they came in and appraised it for 500k after some Reno's that had been done. Anyways, we got denied. Obviously, but still shitty so we decided to move fourth in selling our home which wasn't a terrible idea as we would relocate closer to my SIL, BIL and their daughter, his mom and dad and my mom and her boyfriend as where we were we were a distance from everyone and were very family orientated so it was a pain lugging up two kids, a dog every weekend and then having that distance to get there. So anyways, house went up and we moved out during the showings because of course, covid and with people coming in I was just being cautious and obviously, with two children I didnt want to be stressed about cleaning every day or where to go when we had the showings. So we went to my in laws house and planned on staying there until we found a house so we arent completely rushed into buying something we dont really like. We obviously pay them rent, buy groceries and I took on majority of the household chores right down to washing and folding their laundry and putting it away. Just to be nice as my MIL works everyday. Now, my fil was an alcoholic in the previous years but has been sober for a long time. He stays home and they offered to provide childcare for my youngest daughter whose two if I wanted to get back in the work field. I was delighted and excited as I miss working! So I did just that, I found a job with short hours so it wasn't alot on my fil. I'd work at 5am until 10am a few days a week so it would be even easier for him as she sleeps until 7am and the mornings fly with her, by the time shes up and eating it's almost 9am! Things were going great, I was finally able to get some cash so I could give my MIL some extra money and then I'd buy my fil things that he likes, needs as they didnt accept anything more for childcare and then one day everything switched for the worse.. I noticed he was acting weird then I noticed hed nap for long hours but I summed it up to my daughter exhausting him BUT THEN things got real fucked up. He started hitting on me, screaming at me , going into my room and destroying it, being careless with my daughter ie: I came home and she was running around in the back yard and he was no where to be seen... now, some of you may leave your kids unattended for short periods but everyone who knows my daughter knows shes a dare devil and gets into shit or climbs stuff. shes just not good to be left alone unless its somewhere safe, the living room as the tvs wall mounted and there's gates but even at that, I wouldn't suggest it to anyone nor do I do that myself with her. She ended up going into the hospital recently due to a really high fever and fast heart rate and low oxygen. During that time, I threw her in the bath to cool her off and try to break the fever because it was just unusual that she was completely fine all day then bam, she was like unconscious in her highchair. My FIL came in the bathroom whilst I was in tears splashing cold water on her, taking her temp continuously and trying to decide to call an ambulance or try to wait an hour until her dad got home so I decided to call my mom whose in the healthcare field and as what I should do so she rushed over and was with us in the bathroom and then my fil started smashing her thermometer off the wall, screaming at me and took off with it. I was literally trying to get it back and he was shoving me out of the way, it was an odd reaction. I ran back to the bathroom and my moms with her and my step sons opening her toy and she was starting to act normal again. We took her out and my step son was flipping on the ground trying to get her to laugh and perk up, I was livid at my fil and we were fighting back and forth which I'm not proud of and I've never had a fight in front of my kids but my anger overwhelmed me and I reacted. My mom locked me outside to cool off as she was assuming my fil was drunk and it wouldn't end well. He then hid in his room all night because my partner was home and I'm assuming he knew my partner, his son was pissed. All was fine then bam, her fever spiked and she was like unconscious again so I said fuck this, were going to the hospital. I thought she was going to have a seizure! We took her, they ran blood, x ray, urine test, swabs that all came back fine and we then noticed her sleeping heart rate was 200 and oxygen was 80 so they threw us in the ambulance to a hospital that specializes in children and they were pumping her with tylenol and advil at once like 6 syringes because her fever just kept rising... it eventually broke and it was like 2am when she fell asleep and I took a small nap and 7am rolled around she was completely fine, like nothing happened. The doctors were baffled to why this happened and they made comments about her getting into something or taking medication. I was like absolutely not! When I had a minute to think I remember my FIL took her downstairs where hes working on doing a bathroom and has the floor ripped up and I sent my step son down because I was worried about why he was taking her down and I was cleaning up a spill and making lunch... he shooed my stepson up and came up minutes later all weird and that's when everything that happened, happened. I kept my feelings to myself as I cant prove anything but logically it seems like she got into something, there's nothing toxic upstairs and its child proofed literally everywhere. I keep my eye on her and so does my step son, hes phenomenal! But with my fil reaction to her fever and everything it just seems odd. my partner decided he is unfit to watch her, but I mean hes getting drunk so who in their right mind would leave their child especially that young with someone completely intoxicated? It's common sense, anyways there was a blow out with my partner and his parents and he packed us up and now were at my sils. My mil is fuming, shes mad at me and says my fil is fine to watch her. I tried to explain that there's so many factors playing into this like were looking for a house, going to be moving again, it's almost Christmas, we just dont need me to be working just to smooth it out and make it seem nicer than your husband cant watch his granddaughter because hes drinking. She wont respond to me, I've went over to talk just about random stuff, I've tagged her in funny memes or videos on fb but nothing. I understand shes upset but I dont know what to do? Am I wrong? We were so close so its killing me but I cant override my partner, her dad even if I disagreed with him