Hello I am solicitor with 20 years experience. I will try to help you with this.
I look forward to your reply
It seems that my reply didn't arrive.
If this is a non-commercial situation then there is unlikely to be a problem, but your son needs to check his insurance document to see if he is still covered. If money is changing hands he may we have t tell his insurers if he wishes to remain covered, In any event he should phone his insurers and keep them informed.