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@AVandMomWelcome.. You will need to have an email address for your mother independently of yours. When you need to sync, you will have to logon and off in turn. Probably keep the more active Fitbit logged in.. Probably yours.
What you seeing now is the Multi Function option and both Fitbits "belong" to you and will try and organize the steps. Each will be effectively changing the first to sync.. Not recommended tio use it this way.
See how you go now.
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