Marion must have been born in Wellington in the late 1850s. She would have been named both for her paternal grandmother, and for her father's late sister. Marion married Thomas Samuel Jacka on 21 January 1884 in Wellington.
- Ellen "Ada" Ada Muriel Jacka (1885 - 1944) m 1910 Rowland Paul Houghton (1872 - 1937)
- Marjorie Gwendolyn Houghton (21 April 1911 - 1999) m Taylor
- Harold Edwin Jacka (1886 - 1935) m 1916 Fanny Emily Shepherd (1888 - 1964)
- Frederick Clifton "Cliff" Jacka born 1888 died 1918 aged 30 WWI
- Mabel Aline Jacka born 1891 died aged 2 years in 27 June 1893
- Thomas Selwyn "Selwyn" Jacka born 1893, Auckland died 1917 aged 24 WWI
- Hubert Waters Jacka born 1895 died in 1956 aged 61 m 1920 Rose Maude Charge (23 January 1899 - 1983)
- Edna Marion Jacka born (1896 - 8 January 1927) m Herbert Roland Houghton (1896 - 1969) in 1920
- Leslie Norman Jacka born 1899 died 19 July 1955 aged 55 buried (Anglican) in Purewa Cemetery on 21 July 1955.
Thomas' father was S.S. "Stephen" Jacka, of Wellington. He died suddenly, at his home in Hanover Street, Wadestown, on 17 November 1910. Reports at the time say that Stephen, who was a builder by trade and had had a big building business on Courtney Place, was sitting in a chair at home when he suddenly fell forward and died. He had apparently been born in Cornwall 83 years earlier. His wife Ellen had died two years before in 1908. Stephen left three sons: Thomas in Auckland, and Arthur and Harry in Wellington; as well as two daughters: Mesdames Judd and Kew. Apparently Stephen had also been one of the earliest Wellington City Councillors.
Thomas Jacka died on 26 November 1922. The Evening Post reported:
The death of Mr T.S. Jacka , an old resident of Wellington, occurred at his home, St Helyers Bay, Auckland , on Sunday last. The late Mr Jacka was born in Wellington, and in his early life was a member of the staff of Messrs. Travers and Olliver, solicitors; he was also for a time on the staff of the National Bank. Mr Jacka afterwards removed to Auckland, and was with the firm of Nathan and Co. as manager of their fire insurance departments. When the Norwich Union Insurance Company opened its own office at Auckland, he was appointed manager. That position he held until a few years ago, when owing to failing health he retired. Mr Jacka married Miss Waters, eldest daughter of Mr John Waters, of Pipitea Street, Wellington. He is survived by his widow, two daughters and three sons, namely, Mrs R. Houghton of Hamilton; Mrs B. Houghton, Mr Harold Jacka, manager of the State Fire Office, Hamilton; Mr Hubert Jacka, electrical engineer; and Mr L. Jacka, barrister, Auckland. Two sons - Lieutenant C. Jacka and Sergeant Major S. Jacka were killed in the war. Mr H. Jacka, Wadestown and Mr A. Jacka, Webb Street, Wellington, are his brothers.
The actual death notice lists the Jacka family home as "Hamoana" St Helier's Bay. Thomas was buried in Purewa Cemetery on 28 November 1922.