AITA for giving my daughter $60 a week, but my son nothing?

I (45F) have two kids, 17F and 15M. We moved earlier this year to be closer to my parents as my parents health is declining. My daughter was excited about the move, but my son has struggled to adjust.

Due to the move, my job shifted to hybrid, and I needed a work-from-home setup. My bedroom is too small, and the only options were the lounge or one of the kids’ rooms during school hours. I proposed this to them – my son flat-out refused (“no way in hell”), but my daughter offered her room and half-joked about charging me rent for the space.

I thought it was fair, as I get a $20/day work-from-home allowance. I agreed to give it to her if she was okay with me setting up a small office in her room. I work from 8:30 to 5:00, and she usually starts homework right after I finish, so it’s worked out well.

Now the issue: my son is pissed that his sister is getting $60. I don’t do regular allowances, just canteen money (about $10/week) and other needs as they come up. I told him he had the same opportunity and was now shit out of luck. He got angry and brought up the move, saying he never gets to see his friends. (For the record, I drive them back to visit every two weeks for visits) I told him I understood his feelings but said I wouldn’t tolerate being spoken to like shit. He then started an argument with his sister too – going in on her for being an opportunistic bitch and she called him a whiny little asshole.

To cool off, I offered one of them the option to stay at their grandparents for the night – not as a punishment but to break the tension. My son opted to go & while dropping him off, my mom told me I was favoring my daughter and should be paying them equally. My dad disagreed, saying my son had the chance and was shit out of luck.

AITA?

ETA: The conversation took place over the course of the afternoon, and I didn’t immediately agree to the deal with my daughter. I offered it to my son first, who reiterated “hell no” and “get the fuck out of my room”.

I also should mention the reason I have the smallest room is due to the lack of insulation in the ceiling and flooring making it damp, and as we’re heading into winter I wasn’t sending either kid in there. The room also fits a single bed, and a set of drawers – with essentially no other space at all. We own the house in Auckland NZ, and I don’t have the spare cash to get it insulated at the moment (or even fit any of my equipment to work from home in there).