YTA. I can see how and why you feel the way you do. That said, when you blend a family, you blend a family, and you need to either a) treat all kids involved equally or b) have an upfront conversation as to why you’re not that shows that the goal was equal treatment. For example, I know a family where the kids could get a car if they went to a local school with in-state tuition, or could go out of state but wouldn’t have a car provided. All the dollar amounts didn’t end up exactly the same, but they all had access to the same deal, and made their choices.

That said, “If you move away you get a car but if you stay close we drive you everywhere” is not a good plan for anybody involved.