John Duncan was the son of Roger Duncan & Sarah "Sallie" Redmon, he was born in Bourbon Co., Kentucky.

John 1st married Sarah Jane "Sallie" Adair, in 1830 & they had the following children: Everline Duncan Bruner (m: James Madison Bruner); George Thomas Duncan (m: Louisa Frances West); Angeline Duncan Coons (m: Isaac Franklin "Frank" Coons); Anna Amanda "Annie" Duncan Coons (m: Joseph Wallace Coons); Joseph William "Joe" Duncan (m: Mary Smith Haden); Mary Ellen Duncan Sheets (m: Wayman C. Sheets).

After Sarah's death, in 1846, he 2nd married Nancy J. Loyd on 20 Jun 1847 in Callaway Co., Missouri. They had the following children: John Duncan (never married); Hiram J. Duncan (m: Susan Durrett Reid); Sarah J. "Sallie or Polly" Duncan Hubbard (m: David Henry Hickman Hubbard); Solomon Kelly Duncan (m: Lou Arnold Baker); Susan "Susie" Duncan (Susan died 1864); Nimrod Norton "Nim" Duncan (never married); Richard Benjamin "Dick" Duncan (m: Margaret Lee "Maggie" Loyd); Nancy Fletcher "Nannie" Duncan Baker (m: Edwin West Baker)

SOURCE: 1884 History of Callaway County Missouri; p. 561-563:
Bio for John Duncan, excerpt as follows:
...John Duncan (deceased). He whose name heads this sketch was for years one of the most highly respected citizens and successful farmers of Callaway County, and although he has been dead for nearly twenty years, his memory is still...He was born in Bourbon Co., Kentucky, on the 9th of April, 1807, and was reared on his father's [Roger Duncan] farm in that county. In 1830 he was married to Miss [Sarah] Sallie J., a daughter of William and Anna (Griffith) Adair of that county. She was born January 23, 1811. Two years after his marriage Mr. Duncan removed to Missouri and settled near Millersburg, in Callaway county, where he lived for nearly thirty-five years and until his death, which occurred on the 14th [15th] of February, 1866. On coming to this county he bought a small tract of land, 120 acres in section 1, of Bourbon township, on which he improved a farm...until at the time of his death he owned about 1,000 acres... He was twice married. His first wife died September 5, 1846, leaving six children... To his 2nd wife, formerly Miss Nannie Lloyd, of this county, he was married June 20, 1847. She bore him eight children of whom seven are living... Thus this noble old pioneer settler left a large and worthy family...

SOURCE: Grand Lodge of Missouri (Sandy Clark); Rec'd via email 31 Mar 2010:
John Duncan received his Masonic degrees in Fulton Lodge #48 located in Fulton, Callaway Co., Missouri. He was initiated an Entered Apprectice on 01 Jun 1847, passed to Fellow Craft on 01 Jan 1848 and raised to Master Mason on 02 May 1848. The only office he held was that of Senior Deacon and that was in 1855 and 1858. He died a Mason in good standing in Fulton Lodge #48 on 15 Feb 1866.

SOURCE: Bible of Nancy J. (Lloyd) Duncan, births & death of family members; copies of pages in possession of Judy Penley: