A few cards, like Serve and Buxx and Paypal, allow for easy issuance of the equivalent of an 'authorized user' secondary card. I'm not personally familiar with Buxx and you should read the thread for more, but I believe those are *designed* for parent/minor splits. The card would still be under your SSN but you'd be fully in-charge of the account; the minor shouldn't be able to do anything malicious with your SSN since he'd just be a secondary user, and loading the card remotely should be very easy for you.