I'd like to know if me and my partner are the asshole or not. For background; My sister (F27) has four children (M11, F9, M5 and F1) she had her first quite young and had lots of support from my parents especially with her first 2 children, they looked after them overnight every fortnight over weekends. A rift happened when my sister started to ask more often for the overnight stays, my mom said no and it created a huge argument ending with my sister calling my mom a b#tch and putting the phone down and not speaking to each other for around 2 years (extreme I know but they're both very stubborn people). Over those 2 years, I spent them trying to encourage my sister to talk to my mom and vice versa. They eventually spoke again after she had her third child and he needed medical care as a newborn in the hospital, I looked after her older 2 children for a week while she and her partner stayed in hospital with her then newborn,, convincing my mom at the time to allow me to look after them as I still lived at home with her. Fast forward to the issue today, me and my partner got pregnant and unfortunately our baby was also born ill in the hospital. I required emergency life saving c section, and my daughter needed resuscitation at birth and was immediately rushed to nicu. She was very strong and recovered quickly. We were there in hospital for a week while they monitored and gave medication and treatment to enable us to go home as soon as we could. For our first birth we didn't expect any of the experiences we had and had had a very rough first birth and postpartum period. We were both very shaken from almost losing our daughter. Once home, we stayed with my mom and dad for moral support and moved into the house, which we had bought while we were pregnant, after a week of leaving hospital. The day after we moved in my sister brought her children down to meet our daughter. When she got there I greeted her and the kids and her mood was off to say the least. There was a very strange vibe that I cannot fully explain. She struggled to smile. Me and my partner where still fragile and unknowingly at the time I was suffering with post birth ptsd from everything that went on in hospital. Her eldest held my daughter and her youngest son (5) was extremely excitable, bouncing around which was understandable and lovely to see. However my partner was feeling very protective and asked if he sat next to the baby to calm down and not jump about so much. My sister didn't say a word and just looked on. He continued to be very excitable, not sitting still and slowly jumping around closer to the babies head when my partner put his arm out across his chest to move him back after asking many times to be careful. My sister suddenly stormed out and said come on kids were leaving. I asked what the problem was and she said nothing. The children left fine and happy and her youngest said bye and they were all smiling and happy. My mom lived down the road only a 2 minute walk away. And 2 minutes later I get a call from my mom, she was extremely angry and accused my partner of hitting my sister youngest son. We were very confused and I said no one was hit or physically hurt. She wouldn't listen and said my sister was extremely angry and she wouldn't be that angry for no reason. I heard from my brother who also lived at my parents that she was asking everyone if they believed her, as my brother asked why my partner would hit our nephew. This left us feeling extremely pushed out of the family. I am not invited to family things as much and I feel very isolated, they are the only family I have. I don't know in the fog of everything we are dealing with emotionally if we ata or not. I'm very confused and would like opinions if anyone has any. Was my partner out of line? Should he apologise and move on.