Legally?

You're supposed to get the license before posting any cover material because you don't own the copyright.

What people do is obviously not what the law prescribes.

To send to your son... why not simply use something like Drop Box dot com? That way, only he sees it and there are no issues to deal with .

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.