Cornelius S. Jackson married Abigail (Abbie) S. Tunison on 13 Jan 1861 in Eaton Co, MI (source, county marriage records, familysearch.org). Abigail was the daughter of William and Susan Tunison. She died 22 May 1887 of cancer at 53 years, 6 months and 23 days in Sunfield, Eaton Co, MI. They had a daughter, Dora A. Jackson, b 17 Apr 1869, in Eaton Co, MI.

C. S. Jackson married Clara M. Thompson Fuller on 2 Feb 1898 in Vermontville, Eaton Co, MI. This record from the LDS site gives his parents as John Jackson and Minerva Stilwell. Clara Thompson married first Delos Fuller, had child Elwin Charles Fuller (FAG# 112094801) in 1887 in Lorain, OH, married Cornelius Jackson in 1898, married Ira Chadderdon in 1925 in Jackson and died 27 Aug 1943 as Clara Chadderdon in Marengo, Calhoun Co, MI. Her parents were Washington Thompson and Deborah Lane, both buried in Eaton Co.

Dora A. Jackson married 23 Dec 1891 in Sunfield, Eaton Co, MI, Leon I. Moyer (FAG# 5931256). Leon married Fannie E. Snyder in 1897.

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JACKSON, Cornelius S. Conspicuous among the farmers of Sunfield Township, Eaton County, is Mr. Jackson, who has a fine piece of property on section 36. He was born in Poughkeepsie, Dutchess County, N. Y., April 2, 1834, and is the eldest child of John and Minerva (Stillwell) Jackson. His parents were born in Connecticut and New York respectively and about 1846 removed from Dutchess to Erie County where they lived until the fall of 1856. They then came to this State and established their home in Portland, Ionia County, but later removed to Ingham County. The father died in the town of White Oak in December, 1890, at the ripe age of eighty-four years. His widow still survives and is now eighty-five years old. Mr. Jackson was a lime dealer in New York and owned a vessel on the Hudson River. After he came to this State he was always engaged in farming. He took no part in politics except to cast a Democratic ticket. He and his wife belonged to the Baptist Church. Resides our subject their living children are George, a farmer in Ingham County; and Melissa, wife of Albert Irish, whose home is at Traverse City.

The subject of this sketch was reared in Dutchess and Erie Counties, N. Y., and received a common-school education. He came West with his parents and remained in Ionia County until the spring of 1861 when he removed to Sunfield Township, Eaton County. There he married and then went to Roxana Township in which he resided until about 1870 when he bought his present farm. Removing hither he has been carrying on agricultural work and has put up the buildings now to be seen on the estate. He started out in life poor and what he has, has resulted from his own energy, industry and prudence, and the frugality and good management of his wife.

The date of the marriage of Mr. Jackson was January 14, 1860, and the name of his bride Abbie S. Tunison. That lady was horn in New York in October, 1834, and was a daughter of William and Susan (Beekman) Tunison, early settlers in Roxana Township, Eaton County. She died May 22, 1887, leaving one daughter, Dora A., who is now teaching in the district schools.

Mr. Jackson is a Master Mason, a member of the Blue Lodge at Charlotte, belongs to the Odd Fellows lodge at Shay town and also to the Grange. His first Presidential vote was cast for John C. Fremont and he has always been a Republican. He has held the offices of Highway Commissioner, Township Treasurer and Supervisor, and in the last office has served eight years. The duties which devolved upon him in these several capacities have been conscientiously discharged and his ability has been manifested in a striking manner. In 1900 he was nominated for Register of Deeds of Eaton County and made a strong race, running ahead of his ticket. It was a Democratic year, however, and he was defeated, but only by twenty-seven votes. Mr. Jackson is more than ordinarily well-informed and his standing in the township and county is enviable.

Source: Portrait and Biographical - Eaton and Barry Counties 1891