Organize Family Information for the Moment You Need It
The best household filing system is not the one with the most folders. It is the one another trusted person can understand when something actually happens.
Most households do not have a storage shortage. They have a retrieval problem.
The insurance card is in one app. A warranty is in an email. A school record is in a folder. A photo of an important document is somewhere in the camera roll. Everything technically exists until somebody needs it quickly.
Start with situations people actually remember
Hospital visit. Insurance claim. School registration. Home repair. Travel. Those situations often make more intuitive organizing anchors than file extensions or whichever device happened to receive the document.
Keep the authoritative copy identifiable
A convenient photo or download may be useful, but families should still know which version is current, where it came from and whether an original needs to be retained.
Design for the person who did not build the system
The strongest test is whether another trusted person can retrieve what matters without knowing the organizer's private logic.
A system that works only for the person who created it is organized. A system that works for the household is infrastructure.