I whanau a Sia Kate Isobelle Furler i te 18 o Tihema 1975 i Adelaide, Ahitereiria ki te Tonga. Ko tana papa, ko Phil Colson, he kaiwaiata, ko tana whaea, ko Loene Furler, he kaiwhakaako toi. Ko Sia te tuahine o te kaiwhakaari-kaiwaiata a Kevin Colson. I kii a Sia i a ia e tamariki ana i whakaata ia i te ahua o te mahi a Aretha Franklin, Stevie Wonder me Sting, e kii ana ia he paanga wawe. I haere ia ki te Kura Tuarua o Adelaide. I te waenganui o nga tau 1990, i tiimata a Sia hei kaiwaiata i roto i te roopu jazz waikawa a Crisp. I mahi tahi a Sia me te roopu me te whakauru i nga reo ki ta raatau pukaemi Word and the Deal (1995) me te EP Delirium (1997).
Ko Kevin Colson