AITA for kicking out visitor who wouldn't allow my son to go to the bathroom?

I (m40) have a 14 year old son (J) who is a brown belt in BJJ. He is a very well mannered kid who always tries to do the right things. Related to this, he has always been instructed to be courteous, open the door for women, and generally be polite. He also is taught to just answer adult questions and to not initiate conversations with visitor's. <br><br>My parents passed away a couple years ago, and my brothers family (wife, 2 boys, 1 girl) moved in with us so he could take over the family company. I own a couple barber shops, so it's convenient that we both don't have to commute to work. The family is fairly conservative, and it's caused a few issues over the years. For example, my brother's daughter (19) works as a librarian and goes to University, she'd like to move out but my brother won't allow it. He says she needs to focus on becoming a good wife and mother (she does some babysitting and cleaning in addition to work/school) and she can move out when she marries. This has been a issue because my son has asked why he can't continue to wrestle and I told him because he chose to pursue BJJ. <br><br>Anyway, that's all background. <br><br>The night before last my brother and his daughter went out to dinner at a nice restaurant. He got a call during dinner saying she had torn her ACL and was on the way to the hospital. We (my wife and son) rushed to the hospital and she was in a lot of pain, it was pretty clear she had torn something. An hour later my brother came back and said that it was even worse than initially thought, she needs surgery and will be weeks recuperating. As you expected this lead to a big argument about if it had been worth it to "put her in that situation" (his words). I was angry because my niece was in a lot of pain and I thought it was shitty to make her feel any worse. He thought I was saying she did something wrong when I was just saying it wasn't her fault. We are both pretty stubborn and neither backed down. <br><br>Fast to yesterday. My niece went to her appointment and confirmed the ACL was torn and she'll need surgery in a couple weeks. Since she's in a lot of pain, she's staying in my room and my brother and his sons (12,16) have moved into my son's room. We were cooking up some dinner and the brothers and niece are on the couch watching movies. Late in the morning my son had to go to the bathroom. He said "excuse me" and was heading for the bathroom when the niece asked him a question. The problem is she's on so much pain medicine she's sort of out of it and kept stopping mid sentence and getting confused. After about 10 minutes my son said "I'm sorry, I have to go to the bathroom" and turned to walk away. She sort of yelled at him "don't walk away from me you little shit" I argued with her that she shouldn't talk to him like that, and she said that it was her bad luck that caused all of this and she can talk however she wants and that I'm a shitty uncle for not supporting her. <br><br>For reference, my son has never said a bad word or gotten in a fight. He's just not that type of kid. <br><br>So this is where I might be the asshole. <br>My son came into the kitchen and said "Dad, can I help with anything? I'm worried my cousin won't let me eat dinner". He's a tall, skinny kid who eats a ton. He started getting upset and I said "I'll just order you something, go to your room and watch a movie or something". He was upset because "it's my house and I can't eat with my family". I told him "I'll call her boyfriend and he can tedious her for a while". I get her boyfriend on the phone and he says he's studying for a test and can't. I argue with him for a while and I finally say "fine, but she's not welcome in my house anymore tonight". <br><br>So I go to the living room and tell her to go to her boyfriend and she says "no, I'm staying here". I argue with her and she says "I don't care what you think, I'm in a lot of pain" and I say "you are not staying here if you're going to talk to my son like that. I'll carry you if I have too". So I go get my brother and his sons and I bring them all back to my house and kick her out. Then her boyfriend shows up at my door and she's crying and saying I hit her (I didn't, but I did smack her on the ass and say "let's go") and I argue with him. <br><br>So now my brother and his family and girlfriend are living at his friends house and my son and wife are staying at our lake house. <br><br>AITA?