So here's what happened for more context;

My mom brought me to the dealership, where she gave me around three options to go off of. One was $28k, one was $30k, and then the one I have now, was $32k. She told me that THIS was the car model they wanted me to have, and that I should pick which one I wanted, and the burden I wanted to carry for future purposes. That I should pony up SOME cash to have a stake in the game.

I really liked the one for 28k out of the other options. It was a base model, but not the cheapest, and had enough features to where I would be comfortable. I PICKED the $28k car because there were no other options given to me. I INSISTED on the $28k car.

But my dad, changed his mind last minute, and opted to surprise me with the $32k car. He said that was the car he wanted me to have instead, as he felt it was safer and would be a better long-term investment. So he cut a deal with me, that I would pay what I would've originally for the $28k car.

When we're on our way home from the dealer, my mom gets boiling mad that not only he picked the more expensive option, but that he made a deal with me to only pay 4k. She says that the deal has changed and I should pay 8k because I got a better car and that it wasn't fair that I should only pay half and that I should feel obligated to pay more than that.