okay well I have checked this out and.....
The pilot in command can let any person take the controls as long as the pilot is asured of the following..
1. The person is sound of mind
2. Capable
3. Under full supervision
4. There is no paying passenger or any redemation making staff (i.e F.A.)
..... Yeah ATPL air law eat ya heart out.. thats one exam passed! yahooooo.