Did a post about this when it happened but it is still ongoing, really stuck with what to do. MiL lives 250 miles away, lives with her partner of 6 years, we go down probably every three months, before Christmas we stayed there for five days with them, we have a just turned two year old. My partner doesn’t know his mother’s partner very well. I suspect he is an alcoholic, he has estranged children and an ‘awful’ ex wife which also makes me think he is not what he presents. When we got there he made my son cry by shouting at him. The day after was a family get together, when he is drinking which starts after lunch, he continually makes comments about my parenting and my son, like constantly, I go to tidy up and he says let him explore, I say something to my son he comments on it, he also tries to control everything, after hours of this I said something along the lines of I’ll let him decide what to do next, he then stormed off and very loudly started telling the rest of my partners family how awful I am, I went upstairs and changed my son and when I came back he said oh I suddenly need a drink and stormed off again, found it all really upsetting and unnecessary, neither my partner or MiL said anything to him. I have always made so much effort with partners family and am always the one who plans when we go down and drive that and on at my partner to contact them and I am the one that send photos etc, Fast forward to last week and my sons birthday I had asked my partner to say i don’t want him there for my sons but I want his mum so either she comes alone or they come another weekend. He didn’t say anything to her until the day before and it has obviously all blown up. He has said what do I need from the partner to move forward, I was in a relationship with an abusive alcoholic and he is exactly the same I don’t want anything to do with him but I have said they can come but stay in their camper or a hotel and I will be totally neutral with him but we won’t be staying with them again. I just want to take my son and run, my partner hasnt had my back once. The night this all happened initially I stayed in bed with my son and I could hear him laughing with the partner and it was just so shit.