Ok it may differ from state to state but here in kentucky any land owner can do their own electrical work and theres other ways around it to because i do this for a living and im not even licensed to do it and do it on new homes as well and when the inspector comes the owner just claims they did it,easy as that and have even been doing work when a inspector showed up but as long as you say"your just helping a friend and heres no compensation" its legal as well,been doing this for 15+ years without any problems even have a couple of friends who are licensed who sometimes help me out with them little stickers..lol,theres loopholes in everything..
Yes he can because even though its your house or property its his land and if he wants he can even throw you out.
Only if they are a licensed electrician otherwise it is a code violation and you can report them