You don't need an email address to add family members, you can simply give them a unique username. When creating their profile, after entering them name you'll need to either provide an email address or create a unique username for them.
How do I add family members with no email addresses?
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I created my family members but skipped the step to email/sms them because I wanted to set everything up first. Now I can't see an option to send them an invite, or how they link or join the setup. Can't see any place to enter a unique username.