Robert Napoleon Warren was the son of William Henry Warren and Mary Elizabeth Sheddrick. He was the eighth of thirteen children.

He married Emma Alice Baldwin, daughter of Ervin Baldwin and Cassandra Riggs, on October 11, 1891, in Haxtun, Phillips County, Colorado; they were married until his death. The couple had seven children, namely:

Cassie Belle (Warren) Wood (1892–1929),
Robert Francis Warren (1895–1970),
Mary Elizabeth (Warren) [Horner] Watson (1898 –1967),
Gladys Ella (Warren) Watson (1900–1990),
Emma Alice Warren (1902–1917),
William Alpha Warren (1907-1954), and
Virgil Ira Warren (1910–1964).

HAXTUN HARVEST; Haxtun, Phillips County, Colorado; March 26, 1941:
"R.N. WARREN, RESIDENT HERE 55 YEARS, DIED SATURDAY AT AGE 86
Pioneer Hurt In Fall Two Weeks Previous
Death came to one of Haxtun's oldest pioneers last Saturday when R.N. "Dick" Warren passed away at a hospital as the result of injuries received in a fall. Mr. Warren, who was 86 years of age, had lived here nearly 55 years.
The funeral was held Tuesday afternoon from the Haxtun Methodist church, with Rev. R.W. Drummond officiating. Burial was in the Haxtun cemetery. Services were conducted by the I.O.O.F. lodge, of which Mr. Warren was a member.
Robert Napoleon Warren was born near Liberty, in Clay County, Missouri, December 1, 1854. He was the member of a family of 13 children. He departed this life March 22, 1941 at the age of 86 years, three months and 21 days. When eight years of age, he moved with his family to Worth County, near Grant City, Missouri. There he grew to manhood.
Being of pioneer spirit, Mr. Warren came west in the early days, arriving at Haxtun in May, 1886. Three brothers, John, Sam and Joe Warren had preceded him to this territory. R.N. Warren filed on a homestead on the Frenchman Creek near Haxtun in 1887, and lived there continuously until a few months ago.
Like other pioneers of that day, Mr. Warren encountered many hardships when he first settled here, before the town was built and before the railroad came through. He possessed a wealth of interesting experiences as one of the fearless men who helped build the west and blaze new trails for others to follow.
On October 11, 1891 Mr. Warren was married to Emma Alice Baldwin, who survives him. Seven children were born to them, two daughters, Mrs. Cassie Wood and Alice Warren preceded their father in death. Surviving children are Robert F. Warren of Denver, Mary E. Watson of Haxtun; Gladys E. Watson of Phoenix, Arizona; William A. and Virgil I. Warren of Haxtun. He also leaves 19 grandchildren, seven great grandchildren; two brothers, Joe Warren of Pinedale, Wyoming and Absalom Warren of Rockport, Missouri, and one sister, Mrs. Ella Freemyer of Denver.
Mr. Warren had been in poor health for the past 15 years. He was seriously injured March 17 when he fell on the basement steps at his home, and failed to recover. Mr. Warren will be missed by his family and a host of friends in the community."