http://www.myjacobfamily.com/favershamjacobs/sydneylongjacob.htm has some information on him.
This recollection by Col. Jacob's son Alexis of his sister includes some brief biographical details of Col. Jacob.
Peter Conlan's article, ' "What are you doing for Christ in Birmingham?" The History, Strategy, and Legacy of a Missional Brethren Assembly Founded by Alexis Jacob in 1924' is a chapter in Neil Dickson, T.J. Marinello [eds], The Brethren and the Church, (Glasgow: BAHN, 2020) pp.217-227, and contains quite a bit of information about the Jacob family, including Sydney Long Jacob.
Timothy Stunt
Philip
STEM publishing has a little biographical outline of the colonel, some of his writings and a preface by your grandfather, A. Jacob, at: https://www.stempublishing.com/authors/Jacob/index.html.
Col. Sydney Long Jacob - 19th July 1845 ~ 28th July 1911, age 66.
Birth: Ahmednuggur,Bombay, India.
Married: 19th November 1869 in Poona, India.
Death: 71 Highbury Hill, North London, England.
Burial: Abney Park Cemetery, Greater London.
Sydney Long Jacob (1845-1911) - Find a Grave Memorial
Wife: Elizabeth Petronella Selby - 12th Sept. 1841 ~ 17th Jan. 1910.
Children:
Eveline Mary – 3rd November 1871 ~ 28th June 1954.
Gertrude (Nella) Petronella (H.D. Allen) - 24th Dec. 1876 ~ 18th May 1965.
Sydney Montague (C.M. Eales) - 28th Oct. 1879 ~ 14th Feb. 1977.
Alexis - 27th May 1882 ~ 18th May 1959.
Grace Dunsterville (F.B.R. Spencer) - c1886 ~ 10th Oct. 1917.
Edith Rose - c1888 ~ 18th March 1967.
Father: Gen. Herbert Jacob - 2nd May 1806 ~ 2nd May 1890.
Married: 23rd July 1840 in London, England.
Mother: Mary L. Dunsterville - 20th March 1818 ~ 12th Feb. 1892.
Siblings:
Col. Herbert Bruce (A.K. Dun) - 11th June 1841 ~4th April 1924.
Rose Emily - 2nd December 1842 ~ 30th October 1929.
Alice Mary (A. Roberts) - 24th May 1848 ~ 27th Jan. 1940.
Leslie McNeil (B.M. Beard) - 17th Dec. 1850 ~ 1st July 1932.
Sir Lionel Montague (M.W. Rushton) - 24th Apr. 1853 ~ 9th Feb. 1934.
Florence Amy - 1854 ~ 9th May 1938.
Ada Zaidee - 25th November 1856 ~ 18th August 1915.
John Le Grand (F. Rodrigues) - 27th Feb. 1858 ~ Jan. 1903.
Thomas A. - 1858 ~ September 1946.
