It seems possible that Nelson was one of twins and the only one to survive.
Records of Crawford Co AR Marriage Book H 1906-1911
Nelson Harrison, age 21 m. Myrtle Osburn, age 17
Not found in the 1910 census.
1920 Census. Chester Twp, Crawford Co AR. Hh 47
Nelson's household was the first enumerated in Chester Town in 1930. He was 44 and had married at age 21.
He had to register for the World War II Draft [the "old man's draft] Nelson Brown Harrison, lived Chester, Arkansas. He was 57, born 6 Dec 1884 in Schuyler Co, Ill. The person who would always know his address was Mrs. Myrtle Harrison of Chester. His employer was the Frisco Rail Road Co, St. Louis, Mo., but he was employed in Chester. He was 5'9" tall and weighed about 165 lbs. Gray eyes, brown hair, ruddy complexion.
Nelson and Myrtle are buried in the Chester Cemetery, Chester, AR.
Nelson Brown HARRISON and Myrtle OSBURN were married on 8 September 1906 in Crawford County, Arkansas.41,64 Myrtle OSBURN was born on 26 January 1889 in Arkansas.64,65 She died on 19 April 1948 at the age of 59 in Crawford County, Arkansas.65
Ancestry FamilyTree gives her parents as James Lewis Osburn and Sarah Frances Lee - her full name was listed as Sarah Myrtle Armetta Mae Osburn.
Nelson Brown HARRISON and Myrtle OSBURN had the following children: