One word of caution - you should NOT use two accounts that aren't in your name. You said your son, so I'm assuming it's his account you're planning on using. If your name is on his account, then you should be okay (although I won't guarantee it), but if his name is on it, you'll be flagged and banned - you have to use two accounts under your name.

Just an FYI, so you don't get banned!