Rosemary Edna Fenton was born on
Lord Howe Island on 17 November 1936. Her father, Stanley Fenton, worked as a radio operator at the Civil Aviation Department on the island. Her schooling until matriculation was at the
Presbyterian Ladies' College, Sydney, a boarding school. She also did a course in nursing. When her mother died in 1952, she returned to Lord Howe Island to look after her father and two younger siblings, brother Stan and sister Robyn. While she had left the island to attend secondary school, she used to come home twice a year. Her paintings adorned the walls of her father's house. Sinclair wanted to compete for the
Miss Australia beauty contest. As she lived on the island keeping house for her family, she stitched her own clothes on the basis of a catalog she had obtained from
Sydney. She tried these clothes on her younger 12- year old sister Robyn as a model. She won the Miss Australia title in November 1960 and was very modest about winning the crown. She then went on a prize-winning tour of
Hong Kong,
Tokyo,
Honolulu,
San Francisco, and many other places. Thereafter, she worked as a model. ==Career==