A family constitution is a written document setting out how a family makes decisions about shared wealth: who participates, how disagreements are resolved, what the money is intended for, and what happens when circumstances change. It is not legally binding. Its force comes from having been written together rather than imposed.
A constitution generally covers four things: the family's stated values, the decisions that require group input, the process for making those decisions, and the circumstances under which the document itself gets revisited.
Because it carries no legal weight, a family constitution does not replace a will, a trust, or an operating agreement. It sits alongside them and answers a different question. Legal documents say who gets what. A constitution says how the family intends to behave about it.
The most common failure is writing one and never opening it again. A constitution that is not revisited on a schedule becomes a historical artifact within a few years, usually just as the next generation reaches the age where it would have mattered.
This definition is provided for educational purposes. It is general information, not investment, tax, or legal advice, and it does not account for any individual circumstances.