Sidney had 6 children through his wife Mary Wooddin. They were:
Sidney George Darke born 13 May 1865.
Mary Rosetta Darke born 16 Aug 1867.
Frederick James Darke born 14 Mar 1870.
Joseph Smedley Darke born 30 Jul 1872.
William Darke born 5 May 1875.
Edgar W. Darke born Dec 1878.

William may have married a lady named Ann in 1901, I'm looking for that information now.

Frederick James died 3 May 1873 of typhoid fever. Mary Wooddin, the mother, died 9 nov 1879 of pulmonary consumption. Sidney died 22 Dec 1907 of myocarditis.

I have some information on other marriages of some of the above. What else would you like, maybe I can look.