Most household software is set up by one person and then quietly used by one person. The setup enthusiasm runs out exactly at the moment someone else has to make an account, and the family's shared calendar becomes that one person's calendar with an audience.
One link, one tap, their own account
In Sherpsy, an admin sends an invite from Members — by email, or as a link you can drop into whatever chat your family actually uses. The recipient taps it, signs in, and they're in the household. There is no shared password, because every member has their own account: sign-in is a link or a short code sent to your email, so the thing nobody in a family can do — agree on a password and keep it secret — is never required.
Invites expire, and a used one can't be reused. If a link sat in a group chat for a month, it's dead, and an admin sends a fresh one. That's a small thing, but it's the difference between a front door and a door propped open.
Roles, because a household isn't flat
Members join as adults or as children, and admins can change roles later. A child sees the family's lists and their own chores; the grown-up records — like who owes whom a hedge trimmer in the lending ledger — stay out of a child's view entirely. The boundary is enforced by the database itself, not by hiding buttons.
A household app is only as useful as the second person who joins it.