"Hmmmmmm, parents-in-law can be tricky to shop for. They're family, but they're not quite like your own parents. Let's see......" *Elf taps his chin thoughtfully.* "Do they enjoy spending time together? Maybe you could get them a couples spa day or a romantic getaway. Or if they're more into practical gifts, how about a nice set of matching bathrobes or a personalized coffee mug?"