Relationship to me:- First Cousin, Twice removed.
As shown on the pages of Edgar Thomas, Registry of birth records show registration No. 27598/1885 for Halbert and 27599/1885 for Edgar suggesting Halbert and Edgar were twins. This is dispelled by the birth dates recorded in Margarets Bible showing the dates as recorded here.
Evelyn was born at Hillston in 1888 the daughter of William and Margaret Deas and passed away in Orange 1964.