No one can force you to do what you don't want to do, but the best advice has already been given. Find a way to print them off....(suggestion) tell your son not to delete them until they are printed off. (strong suggestion)
Hint: I have been providing my atty with emails and Web sites for more than a year. She used one of them already in a hearing, and the judge ruled in my favor. (Not saying this was the tipping point, but it certainly helped persuade him, I'm sure).