John Nelen was born about 1857 in Wisconsin to John Nelen (1825-?) and Alice (1823-?). John had two known siblings:
- Thomas (1860-?)
- Mary (1860-1926)
John married Mary Jane O'Rourke (1870-1930) in 1899. John lived mostly in Spring Valley, Wisconsin (1900-1940 censuses). John and Mary Jane had two children:
- George (1901-1985)
- Alice Mabel (1905-1988) my great grandmother
John died after 1940 but I do not have an exact date.