Sister in law is annoying me.

Yesterday was the worst 4th of July for me ever. Usually I never get to spend time with my son because I’m at work so this was the first year. Well my sister in law has two boys around the same age as my son. Her oldest is quit violent towards my son always comes and hits him, pulls his shirt and chokes him...etc. Well yesterday my son was eating fruit and her son comes and shoved him to the ground but they all yelled at my son for crying. I’ve mentioned to her before her son is a little aggressive with mine and she’s they’re boys. I understand they’re boys and occasional fights will happen but this is an everyday all day thing if we’re around them. After that it was like I was excluded from everything. Pictures and them talking and having fun it’s like they made a circle and I was on the outside. Very uncomfortable and annoying. (They speak Spanish I don’t) all together I wasn’t happy the entire time we were with them and it sucks because it was the first year I actually got to spend with my son to see fireworks. We are both pregnant she’s about 7 months and I’m about 9 weeks.