William Wynekoop was born at Kirklin, Indiana, May 21, 1835, the sixth child of a family of twelve children, of which he was the last survivor. In 1857 he located on a farm two miles south of Wolcott, where he lived until 1904, when he left to end his days with his son Dr. Charles I. Wynekoop, of Chicago, where he died December 31, 1913. He was twice married, the first time to Ellen Matthews, to whom was born one child, Lewis Matthews, who survived him. His second wife was Helen Haynes, to whom he was married in 1865, and to them was [sic] born ten children, three of whom had preceded him to the grave. His remains were interred in Rose Hill Cemetery, Chicago.

Source:

Hamelle, W. H., "William Wynekoop," A Standard History of White County Indiana: An Authentic Narrative of the Past, With an Extended Survey of Modern Developments in the Progress of Town and Country, Chicago and New York, The Lewis Publishing Company, 1915, pp. .