I feel really bad even writing this but I am finding my 4 year old nephew absolutely impossible to be around. His behaviour is poor. My sister must be struggling, says she isn't and it's all normal boy behaviour bit it's not. She often will say he's only 4. When he was she used to say he's only 3.
It's having a huge impact on my family's relationship with her.
For example, it was my son's birthday (who has asd) and we were all eating birthday cake round my parents. My nephew grabbed my son's cake of his plate put it in his mouth and then spat it out on my son's plate. I said that's disgusting don't ever do that again. My son was in tears about it as he hates any form of contamination if his stuff. My sister then said I was wrong to say anything to nephew as he's only 4 and it was only a problem because my son's autism. I'm not being funny but anyone regards of needs would have been bothered about that happening to their food.
We've now been asked about Christmas plans and I just don't want to be around my sister and nephew. He constantly breaks things on purpose and laughs, hits everyone, shouts and screams when told no by parents as my sister never says no.
My parents are struggling too as they don't like their things getting broken.
If I ever mention anything to my sister about his behaviour she becomes extremely defensive but I just can't stand their company at the moment and I feel terrible for saying that. Not sure what to do further but limiting contact seems for the best at the moment.