A little while ago, I (42M) took care of my friend Edward's (42M) 15-year old daughter, Mina, while Edward and his wife went out-of-country for a 1-week business trip. Ed and I grew up together, and I am very close with his family, so Mina was comfortable with this arrangement.
One night, while Mina was taking out the trash, she tripped and the trash went flying out of her hands and right onto my car. There were also some blunt objects and glass bundled up in the trash, so not only was my car dirty, but it had suffered some dents and chips as well. As her legal guardian for the week, I took it upon myself to discipline Mina. I knew that during the weekend, she and her friends were planning to go see their favorite artist perform live. So I decided that it was only fair to forbid Mina from going to the concert, and instead get her to assist in cleaning up my driveway and car during the weekend as well as having her do additional chores around the house, to make up for the cost of the damage sustained by my car. Mina is a bit shy and non-confrontational, so thankfully she just took all this without complaining.
Ed and his wife came back from their business trip. A few days after they returned, they knocked on my door, very irate. Mina had told them about what happened with the car, and we had a long, unpleasant and awkward talk about boundaries, and how I was not entitled to discipline their daughter like that. I told Ed and his wife that I would reimburse them for the tickets, and in fact I offered to pay them twice what they paid for the tickets, but they wouldn't hear any of it. Anyway, Ed is now NC with me.
AITA?