Secure the home, wallet, phone, and mail, note passport and ID for later cancellation
Their home, plus the security provider, body corporate, or strata manager if there is one.
Some steps differ by region inside the country.
Where
Their home, plus the security provider, body corporate, or strata manager if there is one.
How
Collect every key and remote, including copies held by neighbours, cleaners, or tenants.
Update the alarm codes and the security company's contact list.
Photograph each room and any valuables before anything is moved, this protects you if the estate is later questioned.
Gather their wallet, phone, passport, Medicare card, and licence into one secure place for later notification.
What to bring
Keys, garage remotes, and alarm codes
The Medical Certificate of Cause of Death or the death certificate
Timing
Same day where practical, certainly within the first few days.
This is practical information, not legal, medical, or financial advice.