I and my two sons share an Apple ID. I use my calendar a lot, for alerts, etc. But my sons are also getting each and every alert that I have set up for my personal appts. I have been researching this online all day and none of it has worked. As shown online, I went into iTunes and checked all the syncing sections. They were all off already. I have automatic syncing off for apps, etc., and don't have syncing on for Outlook or anything. On my iPad 4, I've gone into settings, then iCloud, and all the toggle switches, including calendar, are already off. The boys don't set up alerts on their iPads so I don't get anything from their schedules. I am using the calendar that came with the iPad and have used no other. I have my google email set up on my iPad. I leave it off (couldn't find how to turn off the annoying unread messages badge), and turn this mail on only if I want to email from within an app. For my daily email checks, I use the Gmail app because it doesn't have the badge. But every day, both my sons get alerts about my appts. This is so frustrating! I just want the boys to be able to use the apps we bought for them under our Apple ID, how do we TURN OFF the syncing calendar, please!