I just found the entry for George Glue in the 1828 census.
Glew, George, aged 25, Free by servitude, Atlas, 1828, 7 years, Protestant, Occupation: Nailor, Residing Market Street, Sydney.
Glew, Mary, aged 25, born in colony, Protestant.
No sign of Joseph. He may have been convicted later. The year of arrival given in the census is probably incorrect.
Cheers
Leonie