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The original was posted on /r/AmItheAsshole by /u/Commercial_Road_4314 on 2023-08-24 21:27:27.

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By way of background, both my (23F) sister (21F) and my mom are always late. My dad and I prefer to be early, so it drives us nuts (probably me more than him). She has made me late for countless events over the years.

We are currently in another province for my cousin’s wedding, and when we booked our flights a month ago we discussed that I would have to drive everyone to the airport because my sister and mom don’t drive, and my dad has a knee condition that makes it a bit painful for him to drive right now. The week before the trip, I started preparing my sister for the fact that I would not tolerate her making us late for the flight. Travelling makes me anxious, and I prefer to allow extra time in case any hiccups arise. Because the airport we were flying out of is incredibly busy it was suggested that everyone arrive two hours prior to departure, and I said I wanted to allow an extra half hour on top of that to be safe. We live over 40 mins from the airport and traffic can be unpredictable. This would mean that we would have to leave our house at 10:00 a.m.

On the day of the trip she was still in bed at 8am and there was no sign she’d packed. I knocked on her bedroom door and said, “Reminder that we are leaving at 10am. I’m not joking. Anyone who is not in the car at 10am is not coming with me.” She said she knew, and I’d already told her “a million times.” Regardless, I repeated this again when she got out of the shower at 9:20. At 9:50 we were putting bags in the car, and she was in a towel doing her hair. I gave her a 10-minute warning and walked out the door. By 9:59 we were in the car in the driveway and there was no sign of her - my mom called her from the car and she didn’t answer. At 10:01 I started the car and my mom freaked out, saying there was no way I was actually going to leave her. Shocker - I did. She called my mom’s phone at 10:15 asking “where the f*ck” we were, and my mom ranted about how I was being ridiculous and there was nothing she could do. Traffic was a bit heavier than usual and we ended up getting to the airport 2 hours and 10 minutes before departure, and getting to our gate 25 minutes before boarding. I had time to get a coffee and some snacks and didn’t have to stress that we were going to miss our flight. My sister had to call an Uber and arrived as they were calling us for boarding.

Now a few days later, my mom is still ticked and says I should at least pay my sister back for the Uber, my sister isn’t speaking to me except when absolutely necessary, and my dad thinks the situation is pretty funny. I feel like I was justified, but I’m also open to the fact that I might have been a bit of an AH by leaving her.

I was driving my own car that I paid for and I paid for my own plane ticket, if that matters at all. I have not and don’t intend to pay for her Uber.