<human>: Can you succinctly summarize the text in 1-3 sentences?

Ok this is going to make me sound like a horrible person (sorry in advance). So I got married and I love my new in-laws (parents and sister) but the brother in law is verbally abusive, rude, and just a horrible person to be around. He's also very judgmental and will verbally attack people with whatever their insecurities are. I have pretty bad anxiety/depression that is under control with being around supportive loving people but I can't be myself around this guy at all. I want to get to know my sister in law more and go on trips with her with mutual friends since we're all the same age but I don't want to be around her brother at all. 

Anyone deal with something like this before or is it the 'marry into the family have to deal with it' type of thing?
<bot>: I love my new sister in law and want to do things with her but not her brother. Am I obligated to invite him on trips?