Just a heads up in case anyone is thinking of jumping in to add tablet control (or expand their existing control) -- the Fire has been reported to be one of the best, most cost effective tablets on the market for this purpose and there are reportedly multiple sales and offers of them during Prime Day starting tonight (I think). At least one report has been confirmed to be the 7" model for $29.99. And reports (without price) that the other model(s) will also have discounts.
For $30 my son might get a new Clash of Clans device even!
Adam