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The original was posted on /r/AmItheAsshole by /u/Equal_Grand_1636 on 2023-06-21 13:51:55+00:00.
Sorry if I make any mistakes. English isn't my first language.
I (28F) started dating my girlfriend (Amy - 26F) around 10 months ago. We live away from most of our family members, and have little interaction with them because we're both going through residency.
Amy's brother, Seth (30M) is a single father. He was in town for a work event and left his daughter Mary (4F) with us for a few hours. He was late and already in a hurry therefore it was just a stop by visit, and I was the only one home for the day, since Amy was at the hospital.
I admit I haven't been around children much in my entire life and I have almost no experience outside of hospital settings (back when I was just a med student) for entertaining a child. While we were painting, I gave Amy a bit of the homemade cake we had. After she had some, I realized she was having an allergic reaction. So I got our first aid kit, gave her a shot, and she immediately got better. I then took her to the hospital to check everything again. I told her father via text since he wasnt picking up. Thankfully there were no issues at all.
Later when I explained the situation to Seth he was furious. He said I should've asked him or Amy about Mary's allergies because I was staying with her alone. I said I needed to be warned about this because this was sudden and out of the blue and Mary's nut allergy isn't something Amy had told me about. It simply never came up.
Seth called me an ignorant workaholic woman who doesn't care about family and left. Amy thinks I am right and that he should have told me but she also thinks it is pretty common to ask about allergies while babysitting children. I simply assumed if there was something I needed to know Seth would tell me. AITA ?