Really tough crowd here, but I would have taken care of the car. We've never been helicopter parents but through a combination of steady parenting and good fortune, all kids have been all launched with no real financial ties to us. But there are several items that we have financed in launching them in the world: (1) an undergraduate education at public college rates, (2) a reasonably priced car after graduation to replace the beat-up, hand-me-down vehicle we lent them in high school that they eventually took to college and later drove to the ground, one or two years after college graduation, (3) and a wedding or downpayment on a home purchase.
In any event, I'm planning on living a good life in retirement. My kids are very responsible adults -- and I doubt they'll ever ask us for money to fund their lives or dreams, but I prefer to give them whatever they need while I'm living as opposed to simply leaving them a big estate when my wife and I are no longer around. They can mooch off of me for all the little things they want (which generally means picking up the tab at an expensive restuarant) though they insist on carrying their own frieght for the most part.