William was born about 1860. It is interesting to note that while his mother was born as expected in Wisconsin, his father had been born in Michigan. (1910 census)
Occupation
He is referred to as "Doctor Bill Thunder" (Wisc. Hist. Soc.), which implies that he was a medicine man. (1910 census)
Children
He had the following children with wife Mary (1910 census):
1910 Federal census for Millston, Jackson, Wisconsin; Roll: T624_1713; Page: 9A; Enumeration District: 0083; FHL microfilm: 1375726. Thirteenth Census of the United States, 1910 (NARA microfilm publication T624, 1,178 rolls). Records of the Bureau of the Census, Record Group 29. National Archives, Washington, D.C.