I have 4 kids, and your alot nicer than me! Non are at driving age yet, but we have made it clear how they are getting their firt car.
They have to save for it. I agree to match what they have saved. Ofcourse my 8 yr old thinks a car is so far in the future, she isn't concerned. Where as my 13 yr old is crunching numbers, and trying to figure how much she can save in the next 3-4 yrs.
Now then, we do have an extra house. If we still have it in 6 yrs the 13 yr old says she wants it. I won't give her a car, but a house!! Yes she is hopefull I will give her a house, LOL!