AITA for buying my own kids better Christmas presents than my fiancé’s kid?

I have seven kids, four are (10-15). Three are adults. My fiancé has one daughter (12) that is the same age as one of my kids.

My fiancée lost her job during the pandemic so I agreed she and her kid could live with me. She now makes a small bit of income as a freelance photographer. (About $25k) I run a business and make in the mid six-figures.

The agreement was that she would do the house chores and help with my kids and I would pay the rent. She would also buy the groceries and pay the light bill.

So Christmas came and I wanted to go all out for my kids. I spent about $500 per kid. I did buy all the kids a pair of headphones ($30) and her kid was included. Her daughter loved the headphones, my fiancée admitted.

On Christmas my fiancée was upset because I gave my kids their presents in front of her daughter. She only bought her daughter a funny t-shirt, a photo album with their photos and a small cat figurine. She said I should not have given the big gifts to my kids in front of her daughter. ( It’s MY house!)

She also said she had spent a lot of money on my kids throwing their birthday parties, decorating for the holidays, and hosting movie nights when they came to visit. She said I didn’t warn her that I would be spending so much on my kids.

My ex-wife also complained that I spent way more than she could on the kids.

If I’m paying for her and her kid to live in my house and only buy groceries and light bill, why am I the a——? She should be grateful, especially since her daughter loved the gift.

AITA?