That is what we discovered on Wikipedia relating to the Germein:

Germein is a pop band based in Adelaide, South Australia. Previously known as the Germein Sisters, its members are three siblings, Georgia Germein, Ella Germein, and Clara Germein.

They have toured Europe, China, New Zealand and Australia. Their 2013 debut album, Because You Breathe, was recorded in Ireland.

In 2018, the band played a 15-date stadium tour in the UK, supporting British group Little Mix on their Summer Hits Tour, performing to audiences of up to 35,000 people. That same year, they recorded the single "Knocking At My Door", as a follow-up to their previous track "Talking", which had received national airplay in Australia.