OK, here's my situation. My family has a lot of iOS devices. We have 4 iPads, two iPhones, and 1 iPod touch as well as 4 Apple TVs. Currently, my iPhone and iPad, my kids iPads, and the touch are all synching to my iMac which has the main iTunes library (several hundred albums and 900 movies, e.g. ALL of the content we own). My wife has been synching her iPhone 4 to her laptop for a couple years and wants to start synching with my iTunes library to centralize everything to one master library because she only has SOME of the content on her Macbook. How do we do this without her having to set up her iPhone from scratch and without wiping out everything I've got for my iDevices? Also, I want this all done under one instance of iTunes and one login in my iMac, not separate accounts. I can't copy my wife's iTunes library file over because then I'll lose the ability to sync the 5 devices I'm already synching. All the articles I find seem to be geared towards having one device and changing from an old PC to a new PC. Once this is done she isn't going to be attempting to synch to two computers, she will permanently be synching with mine.