Not in every state. My home state has a pretty nasty inheritance tax return that has to be filed fairly quickly after probate is started and I wouldn't attempt to fill that out on my own.
Great thread! I live 800 miles away from my next of kin and recently covered this topic with my parents. None of my family members has been to my present abode, so no one has seen where things are filed or my hiding places, except in pictures. I've written up a few lists of directions and a detailed asset/liability list, but I think I'm going to make some additions and sending them a DNA sample, thanks to ideas presented in this thread.
While they know where I keep the extra garage remote and my extra keys, I still have a worry. If I would be killed while on a trip, I don't know how anyone could ever find my car at the airport.
Second, about your car at the airport, make sure your parents have the make, model and license plate #, the local authorities could locate the car for them. Good thinking on your part. Thanks for sharing.