Hjelp i forbindelse med fars dødsfall

I have been living in Australia for the last 36 years, I have been informed that my father is now in hospital and am wondering how I would go about finding out information regarding his will in the event that he will soon pass away. After moving to Australia with my mother and two brothers, my father re-married and has another child. Who can I contact to find out if I have any entitlements following his passing away?