Ennis Hastings Watson was born in Belfast, Co Down, Ireland over the Spring months of 1893.
He was the son of James Watson (b. 1856), a shipwright, and Sarah Jane Orr (b. 1857), natives of Co Down who had married in Belfast in 1883. Ennis was one of eight children and he grew up in East Belfast in a Church of Ireland household. His siblings were: Emily Annie (b. 1883), Eva Maud (b. 1885), Adeline (b. 1886), James Pyper (b. 1889), Winifred (b. 1891), William Gilbert (b. 1895) and Sidney Herbert (b. 1898).
On both the 1901 and 1911 census records the family are show living at 75 Madrid Street in Pottinger, east Belfast. At the time of the latter record Ennis was described as an apprentice electrician. Before his apprenticeship at Harland & Wolff, Ennis had been educated at Belfast Municipal Technical Institute studying, among other subjects, art and electronics, and was the recipient of various awards for excellence in his examinations.
Ennis was one of the nine-strong "guarantee group" of Harland and Wolff employees chosen to oversee the smooth running of the Titanic's maiden voyage. He, like the rest of his counterparts, died in the sinking. His body, if recovered, was never identified.
His mother later lived at 53 Hatton Drive, Cregagh, east Belfast and died on 1 February 1937. She is buried in Dundonald Cemetery, Dundonald, Co Down.