How do I keep one user for the entire family?

I want everyone to just use MY account on my wiiU so everything they do and unlock would be on my account. The problem is for Nintendo Land, you play as the mii user. How can my family play as their own miis, but on my wiiU account?

EDIT: Basically we want one account, but use multiple miis in games, instead of only my own, for instance use my sister's mii in nintendo land when she's playing, but be able to go back to mine when I play. Is this even possible? No way are we wasting time with multiple accounts.