Berthel Martin Evenson was born in Bootle in 1895. He was the son of Berthel Martin Evenson and his second wife Catherine Evenson (nee Seymour.)
His parents were married at Our Lady & St. Nicholas' C.of E. Church, Liverpool, in 1888. His mother was from Shefford, Bedfordshire and his father was a mariner from Norway.  
They had eight children, seven of whom survived into adulthood. Charles George F Evensen's siblings were; Martha Kathrina (1890-1892), Thomas Evan (born 1892), Charles George F (born 1894), Anton Christian (born 1897), Evelyn Kathleen (born 1900) and Enid Annette (born 1903). 
He also had a half-sister, Ellen Serina (born 1882) from his father's first marriage to Mary Jane Wharton. This marriage took place at St. Matthew's C.of E. Church, Toxteth Park in 1879. Mary Jane died in 1884 aged 22 years. There was also a son from this marriage called Berthel Martin who was born and died in 1881. 
The family lived at 51 Rimrose Road, Bootle in 1891 and at 41 Rimrose Road, Bootle in 1901, by which time Berthel Martin senior was a dock labourer. He was dead by the time of the 1911 census when the family were living at 27 Cranworth Street, Bootle. Charles George F, at the age of fifteen, was working as a baker's errand boy. 
His brother Charles George F Evenson also fell.