Ok, so here is an interesting question:
I've already purchased all of the iWork and iLife apps for iOS. My grandparents bought their first iPad in late August so they are missing out on the promotion by a matter of days (I think it's from September 1st onward?). So if I go to setup my new iPad Air or Mini Retina, can I log in with their Apple ID (which they wouldn't mind giving me) and in effect "gift" them the apps so that they will show up on their purchase history? Then they can install them on their iPad 4 and I can logout and go back to my Apple ID without messing anything up?
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