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@ JJG (various comments above sobre su tio)

First allow me to hedge my remark as I have not been able to keep up on all the recent pages here at W.O.

Why not just GIVE him outright some BTC gratis?  You could give him $15 worth just as a gift for him to keep an eye on.  Once he has the asset, he will likely want to monitor it for value.  If he will not even bother to set up a BTC account on mobile (perhaps the easiest fastest way for a n00b), then just give him a paper wallet.

You could always tell him to send the $15 back to you in the future (he might if it moons)

Or

Send back the BTC (if he declines to send back the BTC if/when it reaches $150,000, then you can safely say that you won).

Just an idea for your consideration