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The original was posted on /r/AmItheAsshole by /u/throwawa-y0 on 2023-09-10 14:08:08.
Me (M48) and my SIL, “John” (M26) do not have the best relationship. We’re both aware of it. I put my issues aside for my daughter, “Sara” (25) who made it clear she was in love with him and wanted to marry him.
A few days ago we were celebrating my wife’s 48th birthday. They both came along and brought their son (5) with them.
The day progressed well. At night, we had a dinner party where the entire family was around. All was well until I noticed John drinking way too much.
A few hours later, my nephew’s wife, “Laura” went into the kitchen. She came back outside, with John following her. She looked uncomfortable and I noticed.
I walked up to them and asked what was going on and Laura said he’s had too much to drink and was making her uncomfortable (flirting). I asked John to leave and go home because if anyone found out, this would erupt into a huge scene. He refused. That’s when I demanded he leave and then he made a scene. He shouted profanity towards me, which grabbed everyone’s attention.
Sara asked why i was asking him to leave and I didn’t mention why, because as much as I didn’t like John, I love my daughter and her happiness. When I couldn’t explain why, she assumed it was because of our little grudge. She got upset, asides with John and they left.
Days have passed and my wife says I ruined her birthday because of a “little feud”. She’s upset and I haven’t heard from my daughter in days. AITA?
Edit: misnamed.