Am I overreacting????????

This started back in July when we were on a family vacation.......... me and my little brother (he’s 16) got into an minor argument and during the argument he told me “did I forget I was pregnant he would kill my baby” we fussed some more my parents just told him to shut up and don’t say that we stopped arguing but I didn’t speak to him afterwards. Recently in August we all had another argument and he told me once again he was going to kill my baby, put something in my drink so I could kill my baby, he hoped that my baby die and etc... so me and my parents were talking earlier and I said he’s not going to be considered an uncle to my child and my mama told me I should be nice and stop being mean and basically telling me I should just let it go haven’t really spoken to my brother and we live in the same house so do you guys think I’m overreacting to the situation or what ?? Pleaseeeee answer