I have a little bit of information regarding James Calhoon, but our spellings will not always agree, but the names agree.
I am also not sure of the source.I obtained this from my father.It is a typed sheet that appears to be from a book. I can mail it to you if you would like.
Anyway, here is what I have.
Mosby Childers, born 1750 in Virginia, came to Gallia County, Ohio, before 1812.He married Elizabeth Jeffries in Greenbrier County, Virginia, in 1785.
They moved from Ohio to Indiana late in 1831.He was on the Revolutionary War Pension list of 1841 in Indiana.Died in 1843 in Hancock County, Indiana.
One of their children, Martin married Eleanor E. Clark and died in the west after 1876. Their son Mosby J. Childers was born in September (4th was handwritten in) 1828 in Gallia or Hocking County, Ohio.He married Huldah Calhoun who was the daughter of James Calhoun (born 1795 North Carolina, died 1865 Gallia County, Ohio) and his wife Elizabeth Stephens (born 1807 in Virginia; died 1870 in Gallia County, Ohio).The child of Mosby J. and Huldah (Calhoun) Childers was Elizabeth, born in Vinton County, Ohio, April 9, 1852; married Jonathon M. Roberts, son of James Isaac and Amy (Danison) (Note: it appears that Danison is crossed out and Donaldson is written in) Roberts.Elizabeth Childers died September 3, 1880, Beaver Township, Pike County, Ohio.
James Calhoun was the son of Robert and Millie (Molder) Calhoun of North Carolina.(My note, on other papers I noted that Millie may be a nickname for Armilla).
Huldah (Calhoun) Childers was born in Gallia County, Ohio, February 9, 1832; died November 15, 1915, Beaver Township, Pike County, Ohio.
Hezekiah Roberts' estate was settled in Ross County, Ohio, 1824 - Richland Township (now in Jackson County, Ohio).he left a widow, Elizabeth Cozad, and three young sons. He (Hezekiah) was the son of William Roberts of Ross County, Ohio.
Dan Roberts of Adelphi, Ohio, married Rebecca Hinton of Ross County, Ohio, in 1804.Removed to Delaware County, Ohio.
Robert Calhoun (Cahoon) was an early pioneer of Gallia County, Ohio, where he died early in 1820, leaving a widow, Armilla (Molder) Calhoun.Also, left sons Zadock, Sampson, James, and Abner and several daughters.
I am not sure if the following information is related to the Calhouns, but it was on the bottom of the page and there was no indication that they were discussing a different family line.
Elisha Bonhom and Catherine Dustheimer were married in 1815 in Licking County, Ohio, moved to Marion County, Ohio.They are interred in Guthrey Cemetery, LaRue, Ohio.
Howard Havens and Susan Carter married in 1832.Died in Jackson County, Ohio. (1871 written in)
Simeon Carter and Sarah Havens married in 1831. Died in Jackson County, Ohio.
Both marriages in Tezewell County, West Virginia.
Hopefully this can help you.