"Sistergirls and Brotherboys (also referred to as Sister-girls and Brother-boys) are terms used to describe trans and gender diverse people in some Aboriginal or Torres Strait Islander communities. ‘Sistergirl’ and ‘Brotherboy’ are sovereign terms coined by the First Nations people of this continent." source
"How the words Sistergirl and Brotherboy are used can differ between locations, countries and nations. These terms may not specifically define who someone is, but might complement identity. Sistergirls and Brotherboys might be non-binary, female or male." source