I tend to agree with kevb. Everyone can talk to any Dot, but personal data would require separate accounts. But, then none of the non-prime accounts would have any access to much music. Personally, I would add all Dots to the same Prime account to have access to prime music. (They could all be changed over from it at any time by unregistering any particular Dot,) Don't worry too much about the kids using the calendar or schedule -- most teenagers would likely not use them. Besides, if they have smartphones they have these features anyway.