I (26F) live with my partner (27F), my son (7M) and my brother (25M).

However him moving in was one of the requirements to getting this house, its a rent to own situation that I wouldn’t have taken if I knew this would happen.

There's been a whole list of reasons why I want him out of the house but I’ll focus on the most recent one.

Our grandmother took us to a parade yesterday evening on the 23rd of Nov, she was on the phone with my brother so she asked him to let us know she was here, he proceeded to snap at me to get my attention and let us know she was here. Now I don't usually talk to him but I don't like being snapped at, l've had it done enough when I was in the restaurant industry.

I went outside with my son and partner right behind me, he was talking with our grandmother so l waited quietly until he was done talking before I started talking, our conversation went as follows.

Me Please don't snap at me, I don't like it, just call my name like normal.

Bro What? No I didn't.

Partner Yes, you did, we both heard it.

Bro No I f*cking didn’t.

Me(having lost my temper after he cursed at me) Yes you f*cking did.

Bro(now stomping off, yelling, into the house) ; Fck you, you fcking f*ggots (referring to both me and my partner).

Me(now also yelling) F*ck you!

This is where our verbal altercation ended, afterwards our grandmother refused to talk about the situation, saying we wouldn't go to the parade if I continued to talk about it. She also proceeded to say that he only said it cause he knew it would piss me off and he didn't mean it because our sister and his brother are gay.

She also refused to help me kick him out because quote, 'He's on the Lease! Which enraged me to the point that I got a stress migraine. I told her I don't care and that I'm talking to her husband about it when he gets home during the second week of his Christmas break.

It's important to note that Our Grandmother and her Husband are the Owners of the house and we are the renters, and I can't go to her husband because he is away for months to a year at a time for work, so I can really only talk about these things with our grandmother.

I feel like the asshole because I keep dragging my grandmother into the situation but I’m at my wits end and I honestly don’t know what to do.

So AITA for this Situation?

Edit: For clarification he constantly makes racist jokes towards my POC partner and is rude and confrontational on a daily basis.