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One family, one card: why two children should not be two customers
A mother with two children in your school is one relationship, one card and one decision. Software that was built for appointments sees two customers who happen to share a surname — and sometimes not even that.
This sounds like a detail until the first month of billing. Two charges leave the same card on the same day. The parent gets two receipts and phones to ask whether they have been charged twice. You explain that they have not. Next month, the same call.
Then a card fails, and it fails for both children, and you find out twice.
The unit of this business is the household
It is worth stating plainly, because software rarely does. In a school for children, the person who pays, the person who decides and the person who attends are three different people, and only one of them is the student.
Everything about billing belongs to the household: the card, the invoice, the sibling discount, the pause over the summer. Everything about learning belongs to the child: the class, the attendance, the belt. A system that puts both on the student record ends up asking the six-year-old to pay.
Surnames do not group families
The tempting shortcut is to group by last name. In practice, siblings in one household routinely have different surnames, and two unrelated families in a school of two hundred will share one.
Group by the payer instead — the adult and their email address. It is the thing that is actually the same, and it is the thing the card belongs to.
Moving a child between households
This happens, and it is worth deciding in advance rather than during the conversation. A child moves from one household to another when guardianship changes, not when someone else happens to pay for a term.
The important part is that old records do not move with them. The classes a family paid for stay attached to the family that paid for them, or your history quietly rewrites itself every time a situation changes.
The second parent
The other adult usually wants the schedule and not the bill: when is Thursday's class, who is teaching, did she go. That is a different level of access rather than a second account, and giving them their own view is the difference between a parent who checks and a parent who calls.
What this means for your website
Two children in two classes are one household: one card, one charge a month, one invoice, and a sibling discount if you give one. The second child of the same parent email joins the family automatically rather than starting a new one.
A child already in a household is never moved by us. Which family a child belongs to is your decision — it changes for reasons that have nothing to do with who paid last.