AITAH for having an affair with my son’s best friend’s older brother?

My son and I have a great relationship. I’m always the one taking him to football practices and games etc. Usually when we’ve to travel to a match we organise in a group chat who drives who. As I always drive people often asks if I can pick them up. My son’s bf is always with us and it’s either one of his parent or he comes along.

Well last couple of weeks his older brother has been coming instead and during the game we’ve been talking. He’s a tall handsome man and of course this was the first thing I thought but being a 52 year old woman I didn’t think much of it as he’s younger. We talked casually during the first time we met and we clicked well. I preferred to talk to him rather than the other parents my age. After that day he started showing up for practices and other matches and we got to know eachother better. After few meets at football practices he asked for my number so we could «schedule pickups easier» and I gave it to him. Couple days later I was shocked when he asked me out on messages for a coffee.

I agreed and we got to know eachother even more. Couple dates later it started to get a bit intimate and let’s just say he’s been visiting me sometimes when I’m home alone. I do love this man but he’s much younger and I’m afraid my son will find it weird and don’t want me around as much. Our relationship is great right now but I’m afraid this can ruin it. After all it’s a bit weird considering I’m almost 30 years older and he’s his bestfriend’s brother