What is your grandfather's original name before picking up any matai titles? Is he still living?
The patriarch of the HUNKIN Clan was Matthew Hunkin of England. Do you know which one of Matthew's children your great-grandmother descends from?
Did Kalala pass away in Samoa? Or the States? Or...?
Are you related to the TUITELE Family? Or TUITELELEAPAGA Family?
Have you tried contacting Eni Fa'aua'a Hunkin Faleomavaega, Jr.? http://www.house.gov/faleomavaega/
Is your dad near NT? QLD? NSW? These are areas of Australia where descendants of George "Siaosi" HUNKIN dwell today.