Emergency contacts
Check their phone contacts and address book
Some steps differ by region inside the country.
Where
Their phone contacts, WhatsApp, email address book, and any physical address book or fridge list.
How
Look at recent calls and WhatsApp chats first, the people who matter are usually in the last two weeks of activity.
Check for contacts saved with labels like Mom, Doctor, Attorney, Broker, or ICE.
Search their email for signature blocks, which often carry a professional's full contact details.
Ask one or two close friends to help fill the gaps, they will know people you do not.
What to bring
Their phone, and the PIN or pattern if you have it
This is practical information, not legal, medical, or financial advice.