Request iBooks sync with iCloud account not iTunes accounts
In my family there are five of us. We all have some form of an Apples product (iTouch, iPads, iPhones). We share the same iTunes account but have individual iCloud accounts. The issue we have with ibooks is the syncing. Having iBooks sync with iCloud account instead of the iTunes account will solve some of the issues that we are having. me and my wife both have iPhones and iPads, the kids have iTouches and iPad. Unfortunately when one individual change something it will change on the rest of the devices.
iBook