Hello Debbie,
This Garrett was born near Rathcormac Co. Cork in 1802 and he married Ann Russell, daughter of Christopher and Ann Russell (nee Blackburn) at "Rosebrook" Maneroo (now Monaro) NSW on the 13th May 1841. Ann was born at Galbury, Co. Tipperary in 1816. Ann died 19th April 1897, and Garrett died 22nd June 1886, both died at Michelago NSW. They had eight children. You can read about his interesting life in a book called "Cotter Country" by Bruce Moore on sale at the Australian National Library.