No, you can't do that, unless the Apple store manager is feeling really nice. By paying full price your father implicitly agreed to the sales term on regular pricing. That and the fact that if they said yes to you, they'd have to say yes to every random stranger that comes in with an MBP receipt and shows them a student ID, not very business wise, don't you think?
If you really want to pay edu discount, if you're within the 14 day window, you could always return the computer, and buy another one, though I personally wouldn't do it.