When Cecilia Bertha Prosser was born on 15 December 1911, in Derby, Tasmania, Australia, her father, William Prosser, was 51 and her mother, Hannah Penoninah Sarah Sabina Morris, was 38. She married Hubert Vernon BECK on 7 February 1933, in Launceston, Tasmania, Australia. They were the parents of at least 2 sons. She died on 1 February 1999, in Queensland, Australia, at the age of 87.