I have a setup in the house where the entire family is using one Apple ID for sharing Contacts, Calender, Notes, as well as Find My Mac. It all works fine, but in order to have FaceTime and Messages working right, everyone in the household also have their own Apple IDs for these apps. That also works fine. Now I have just reinstalled everything on my Mac Pro, I'd like to start using "Keychain in the iCloud". However, it is my understanding that this means all the Keychain info will be distributed to everyone, and I don't want that. Hence, my question is, "can I link Keychain to a specific Apple ID?"