Help!

My husband and I are planning our baby shower and he invited his aunt. Not a big deal but of course if she comes she’s going to bring her 9 and 11 year old. Not a huge deal either but they don’t behave as well as most 9 and 11 year olds. We went out with them and they where eating their food with their hands! Then they where talking about guns and killing people and very inappropriate things (poop and body slamming people). The mother just kept saying that wasn’t appropriate talk and that they needed to stop. When my brother was that age he never acted like this (that’s also because my parents would have been disciplined him). Do you think I’m being a little unreasonable?