Need some suggestions on the best way to use iCloud. Right now our family has two iPads and after tomorrow will have two iPhones. One each for me and one each for my wife. Right now I have iCloud set up to the same apple Id as our iTunes on all devices. All backups are going to that id and I paid for extra storage. We have individual apple Ids for FaceTime, messaging etc. My issue is I don't want all of my wifes contacts/ calendars etc pushed to my devices but I do want the wireless iTunes feature and common cloud storage of our music collection. Any advice?