Google accounts question

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http://androidforums.com – Hi, I have a question regarding google contacts, calender and email. I've been on android for a couple of years having had the galaxy s2 and now the s3. Yesterday I convinced my wife to leave apple and join me in the android world. Her galaxy s3 arrives today! My main concern is the google account. In the past we've successfully shared a calender from my google account. She has always had her own Yahoo mail account. Now that she's going Android I'm confused as to how we can make things work. I want to use my account on both phones for the Play store and the calendar. However, i need to (General)