During registration all users need to be on the same address as the owner of the premium plan. After that they need to visit the same physical location periodically in order for the plan to stay active.
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“With freedom, flowers, books, and the moon, who could not be perfectly happy?” ― Oscar Wilde
Going by the terms and conditions, you cannot have a family plan with members outside of your home. However, there are illicit ways of you getting around that. You have everyone that wants to be on the plan, join the website from your address using one central wifi hotspot. Once the verification is complete, everyone can go back to their own home. In addition, you can use a VPN to make it appear that everyone is at the same place.