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Hi, welcome to justanswer.com! My name is Mike.I am going over your question and I will be with you shortly.
You just need to sign in with a different Apple ID on all those devices, you may want to turn on Family Sharing see here: http://www.apple.com/icloud/family-sharing/
Create new apple IDs here if they don't already have them: https://appleid.apple.com/account#!&page=create
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Did you try that?