William Ennis was born in Ireland [or possibly Canada] in 1840. George E. Ennis was born in Canada in 1847 and James was born there in 1848. They came to Wisconsin with their parents and other siblings in 1848/49. The family settled in Buffalo Twsp., Marquette County, Wisconsin.
William lived and worked in Marquette County until 1883. He apparently never married. In 1883, the Montello Express reported that he had acquired land "out west." This land was in Viding, Clay County, Minnesota where he was recorded on the Minnesota state census in 1885 along with his brothers George and James. Sadly, in October 1887, the Wisconsin State Register reported that William had been accused of pilfering township funds in Viding and was believed to have fled to Canada. I have no further record of him. What became of William Ennis after 1887?
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Meanwhile, George had married Hannah J. Neale on 4 July 1881.
https://www.familysearch.org/ark:/61903/1:1:XRNY-26BOn 17 January 1893, Hannah J. Neale married David G. Ritchie
https://www.familysearch.org/ark:/61903/1:1:XRNT-BZPPresumably, George had died before 1893 or George and Hannah had divorced but I can find no record of either. The last confirmed record of George is in the 1885 Minnesota state census when he was recorded in Viding, Clay County with his brothers William and James. In that same year, he was also involved in a legal wrangle with his father in Marquette County, Wisconsin. What became of George Ennis after 1885?
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And James Ennis had married Mary Blume [or Bloom] on 15 March 1875.
https://www.familysearch.org/ark:/61903/1:1:XRLQ-CXRThey had one son, John William Ennis born in 1876 however by 1880 they were separated and thereafter lived apart. Whether they were ever actually legally divorced is unknown. Mary Blume Ennis and her son lived quietly in Portage, Columbia County, Wisconsin.
James was in Minnesota in 1885 with William and George. I haven't found him on the 1900 census. On the 1905 Wisconsin state census, he was working as a servant [presumably a farm hand] for Hannah J. Ritchie, his widowed former sister-in-law, in Packwaukee, Marquette County, Wisconsin. The last sighting of James was in 1906 in Marquette County when he served as a witness for his sister Mary Ennis McGwin in the probate of her husband's will. What became of James Ennis after 1906?