I bike to school and home most of the time, and my brother is supposed to, too- except he decided to walk today. When I caught up to him, he had fallen over and scraped his ankle. 

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I was in a horrible mood, because I had two huge tests today (that I probably have failed lol) and told him (not too gently) to get on my bike and propel himself forward with his good foot. My brother was screaming and wailing literally at the top of his lungs (he's in 8th grade) for at least 30 minutes, and I put up with it for the rest of the walk home, and then helped him to get up the stairs, wash the wound and put ice on it.

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Tomorrow I have a French test and more homework due, and I didn't want to sit there and listen to my brother's wailing. Also, I thought he needed to rest. So I left my brother alone. 

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My brother called my mother, who came home screeching at the top of her lungs how I was "cold-blooded" and "heartless" and how I needed to sit there, pour hydrogen peroxide all over his wounds, comfort him, and basically do whatever he tells me to. I'm not his servant, and I have tons of homework!

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AITA for not helping my brother? I kinda feel guilty about leaving him there, but I didn't know what else I could do- he didn't break or twist his ankle, and the scrape wasn't too deep. He didn't need to go to the ER or anything. Was I in the wrong? 

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