I have the following as children of Thomas Graham McKoin & Susanna Barham; 1-Mary McKoin b 29 Sep 1816 d 8 Jan 1892 (dates from stone) bur Mt Comfort Cem, Franklin Twp, Greene, MO bur next to 2nd hus Thomas Jefferson Whitlock (div from 1st hus) 2-James McKoin b abt 1816/17 may have married Lucinda Hocker Lawrence Co MO 3-Dorcas McKoin b 4 Nov 1819 d 7 Dec 1888, bur Williamson Cem, Walnut Grove Twp, Greene, MO, mar James B McElhannon 4-Minerva b 8 Aug 1821 d 13 Mar 1853 bur Murray Cem, Murray Twp, Greene, MO, bur next to bro Clayton B McKoin, she mar Wm. Dunn 5-Elizabeth McKoin b abt 1822 d aft 1870, mar John B Cox, he died 19 Feb 1886, he's bur Hazelwood Cem, Springfield, Greene, MO 6-Cassandra E G McKoin b 3 Feb 1825 d 16 May 1907 Albany, Linn, OR, mar Wm. Delaney 7-Sarah Angeline McKoin b abt 1826 d aft 1895, m/1 John Hightower, they are in the 1870 Crawford Co KS census, some researchers have her m/2 Thomas Preston Hightower in Hill Co TX 1895. 8-Martha McKoin b Dec 1829 d aft 1900 Long Creek Twp, Grant, OR, mar Benjamin Sloan 9-Thomas Eli McKoin b Aug 1832 d 21 Mar 1931 Fresno, Fresno, CA age 98 yrs, mar Maranda Cullison 10-Catherine McKoin b 12 Oct 1830 d 30 Nov 1883 bur Hazelwood Cem, Springfield, Greene, MO 11-Jane McKoin b abt 1834 12-John C McKoin b 1 Jun 1836 d 31 Jul 1907, bur Hazelwood Cem, Springfield, Greene, MO mar Christina Scott, she is also bur Hazelwood Cem. 13-Clayton B McKoin b 15 Jun 1838 d 15 Oct 1853 bur Murray Cem, Murray Twp, Greene, MO (In the printed record of Murray Cem, Greene Co MO Cemeteries Vol III pub Ozarks Gen. Society, it lists him on pg 65 as Layton B McKoin 15 Jun 1838-15 Oct 1853.On pg 69 is this; additional information found by the Cochrans in the 1960's-McKoin, Claton 15 Jun 1838-15 Oct 1853.I know that it is possible that there were 2 sons, Layton & Clayton who might have been twins.But I don't think they would have both died the same day, possible??Unless Layton died before 1850 he is not listed in the 1850 Greene Co MO census.Only Clayton B, age 12 is listed.)Hope this helps.