Name changed and going to be locationally vague, because I don't want to start a drama if this is outing.
We emigrated to another side of the world a couple of years ago, and my parents are coming to visit for the first time (although only seeing us for the first couple of days before essentially going on holiday to the rest of the country). They are in their 60s and have never flown this far before (it'll be over 24 hours of flying on the route they've picked), and I literally cannot get them to understand how tired they are going to be when they arrive. They seem to think that in the couple of days they'll see us, they'll be full of energy for full days out.
Obviously, we have done this journey, and we were exhausted for several days after arriving (let's not also get into the fact that we caught something on the plane, and my parents have gone vaccine-sceptic, that's a whole other thing). Even before the illness hit us, literally all we wanted to do on our first day was sleep.
The most worrying thing is that they've booked a car hire from the airport and are planning to drive to their accommodation near us the moment they get off the plane (we don't live super close to the airport, but are in the same city). They won't let us come and pick them up, and just won't believe us when we say they will be exhausted and not safe to drive.
Am I being unreasonable to labour this point with them? I'm terrified they'll fly here and immediately have a road accident because they're too bloody-minded to believe they will be tired!