The motorcycle he is riding is actually registered in my name, yet they will not give me the permit either as you can only have one temporary permit at a time. Well, actually you can have two permits as long as the vehicle types are not the same... So if I was driving a car and my son a motorcycle then it wouldn't have been an issue but now that we both ride motorcycles it can't be done... work that one out! Motorhomes can pull trailers, trailers may carry up to 3 motorcycles on temporary permits but they won't even give us two temporary motorcycle permits. I could understand the age might be a problem if he is on his own but he is travelling with his parents! I offered to sign a declaration taking full responsibility but it was to no avail. We spend almost 7 hrs today trying to get this fixed but there simply was no-one willing to sort this out and give us an exemption. We were really looking forward to the Yucatan... it's not going to happen.
The stupidity is that he is still allowed to ride a motorbike in Mexico, as long as it's not his own. Now that really makes sense. His license is valid, his age for riding a motorcycle is not a problem and the insurance is still valid too. It's just the temporary import permit cannot be signed by him as he is under 18.
We are looking into our options as I write this. Shipping the bikes to Guatemala or even Ecuador for instance.