The things you look for exactly when you cannot think straight.
A record per family member
Blood type, allergies, chronic conditions, insurance number, current medication, appointments, vaccinations, tests and procedures — with the next due date where there is one.
Measurements
Height, weight, temperature and blood pressure over time, with a growth chart for children. No percentile curves — those reference tables are a data set rather than a feature, and the chart is honest without them.
Reminders
Vaccinations and follow-ups that have a single next date announce themselves. Medication is recorded and displayed but does not generate tasks — "twice a day, indefinitely" is a design question rather than a reminder, and until there is a good answer we would rather promise nothing.
Privacy, specifically
Health records are adults-only by default. A teenager on a limited account sees their own record and nobody else's. Health does not appear in search or in the activity log unless it is explicitly asked for. A record that is not yours answers "no such page" rather than "you have no access" — because whether someone has a health record at all is itself worth not revealing.
The emergency sheet
One page, assembled from what already exists: everyone's blood type, allergies, conditions, medication and insurance number; the emergency contacts with tappable numbers; and the documents, with the note saying where the original is kept. It prints from the browser, black on white, each card kept off a page break.
Offline — and off until you switch it on
An emergency is exactly the moment the network is missing, so the sheet can be kept on the device itself. But blood types and insurance numbers sitting in a phone's storage are a decision for the person who owns the phone, so the toggle is off by default, and turning it off wipes the copy.
Start with the one deadline you cannot afford to miss.
Set your family up in two minutes. Thirty days of everything, and it does not ask for a card.