I believe each Mii you want to have in game has to be a "Login" Mii.
What I mean is when you turn on the system and select a Mii to login as.... You need to make each family members be a Login in Mii.
You don't need to go the whole way and make them a Nintendo account unless you want their Miis to access the online stuff.
You don't have to re-create their Mii's... When you make their login in "accounts" it will ask if you have a Mii already etc...
Doesn't matter who logs in when sysem is booted as all the login account Miis will be usable in game...
Hope this helps.. And I hope I made sense lol


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