Most families build the emergency binder once. It goes on a shelf, everyone nods, and then nobody touches it until a night when the phone rings and the page with the right number is two years out of date. The binder is cheap to make. The work is in keeping it true, and that work needs an owner, the same as the car or the gutters.
Local option: New Plan Care gives families in the St. Louis area in-home help so a parent can stay home: companionship, help with bathing and dressing, meals, and overnight care. Call (314) 405-0887.
What belongs in it
Keep the list short enough that someone will actually read it at 2am. Put in the names and numbers of the doctor's office, the pharmacy, the insurance company, the neighbor with a spare key, and each sibling in order of who answers first. Add a copy of the insurance cards and the photo ID, and a one-page note on who has power of attorney papers and where the originals are kept. If the family keeps a medicine list, it stays with the family, the doctor and the pharmacist. The binder can say where that list lives. It does not need to hold the list itself.
Name the owner
Write one name next to the words refresh owner. That person is not doing every update. They are the one who asks, once a month, whether anything on the page has changed. A new pharmacy, a new neighbor, a sibling who moved, a phone number that now goes to voicemail. The owner does not have to make every change, but they have to make sure the changes get written in.
Set the check
Pick a date each month and put it on a calendar that everyone can see. On that date, the owner reads every line of the binder out loud, or at least checks each number by calling it once. A number that rings through is a good number. A number that goes to a voicemail nobody checks gets flagged. Keep a log on the inside cover with the date of each check and the initials of who did it. The log is what tells the next person the binder was looked at.
Where the copies go
Keep one paper copy in the house where the parent lives, and one digital copy that two siblings can open from their own phones. If the only copy is in one person's car, the binder is only as reachable as that car.
When you hand off the owner role, do it in person or on a call, and walk through the log. A binder with no log and no named owner will go stale on schedule, and the person who finds out will be the one standing in the emergency room doorway.