I believe most purchased licenses allow you to install on several devices, which can be a combination of MAC or Windows (each install does count as a "use" of the license); if anyone reading this paid for a second license contact Intuit and ask for a refund; they are notorious for trying to get you to buy TT at every turn, even when you already own it (yet another SUPER annoying part about dealing with the online e-file extension issue; I'm sure some percentage of flustered users get ripped off by TT by thinking they need to pay for it again...). For your kids, their income is probably low enough they could file for free online using any of the programs; good chance to compare programs maybe?
