I have wondered the same thing.
Well, they both come from Adelaide, and both are very musically talented (singing being their best attribute). It's highly likely! Very different musical careers though...
No, they are not closely related. Peter was born in McLaren Vale (about 40 km from Adelaide) in September 1966 to Bill and Rosalie Furler (Christian missionaries). Sia Furler was born in Adelaide in 1975 to Phil Colson (musician) and Loene Furler (art lecturer).
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Actually they are first cousins, indicating that Sia's mother Loene and Peter's father Bill are siblings.
Sia Furler is an Australian born pop and jazz singer-songwriter who had a United Kingdom top 10 hit in 2000 with "Taken for Granted". Sia had a European hit with "The Girl You Lost to Cocaine" in 2008. Since 2005, she has been based in New York City. In 2010 Sia was diagnosed with Graves' disease (a thyroid gland disorder) and after rest and treatment, she resumed touring into 2011.
No. She has described herself as not particularly religious, but still something of a polytheist.
no.
No "he" is a girl.
Sia