Son of John T DeMoss and Nancy Hazlett DeMoss Matthews.

Brother of:
--Children of John T Demoss
Dwight DeMoss(Sep 1876-unk)
Roy DeMoss(Jan 1884-unk)
Melie DeMoss(Oct 1886-unk)
[Harry Smith DeMoss]
--Children of T M Matthews
Myrtle Matthews(Jul 1894-unk)

Paternal grandson of Peter Demoss and Elizabeth Hays Demoss.

Married to Bertie Young on March 24, 1907 in Crawford County, Arkansas.

Married to Mary Simpson on January 18, 1921 in Johnson County, Arkansas.

Harry and Mary were the parents of:
Jessie Geneva DeMoss Moring
Infant Son DeMoss
John William DeMoss
Harry Smith DeMoss Jr
Jeannie L DeMoss Bragdon
Delma Lee DeMoss Brewer
Paul Vernon DeMoss
James Edward DeMoss
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Note 28 May 2020: Per member Faith Gould Byrd #46988323, his mother was Nancy Evaline Cantwell DeMoss Matthews[1857(MO)-1901(AR)]. I cannot find any pre-marriage documentaion on either maiden name Cantwell or Hazlet.
**********************************
1900 United States Federal Census
Name: Harry Matthius
Age: 11
Birth Date: Jul 1888
Birthplace: Missouri
Home in 1900: Upper, Sebastian, Arkansas
Street: South R Street
Sheet Number: 3
Number of Dwelling in Order of Visitation: 53
Family Number: 55
Race: White
Gender: Male
Relation to Head of House: Son
Marital status: Single
Father's Birthplace: Ohio
Mother's name: M E Mathews
Mother's Birthplace: Missouri
Occupation: Scholar
Attended School: 4
Can Read: Yes
Can Write: Yes
Can Speak English: Yes
Household Members:
Name Age
M E Mathews 33 b.MO [5/6 children living]
Dwight Mathews 23
Roy Mathews 16
Melie Matthius 13
Harry Matthius 11
Myrtle Matthius 6
Mollie Moss 21

Arkansas, County Marriages Index, 1837-1957
Name: Harry De Moss
Gender: Male
Age: 21
Birth Year: abt 1886
Residence: Midland, Sebastian, Arkansas
Spouse's name: Bertie Young
Spouse's Gender: Female
Spouse's Age: 19
Spouse's Residence: Midland, Sebastian, Arkansas
Marriage Date: 24 Mar 1907
Marriage License Date: 23 Mar 1907
Marriage County: Crawford
Event Type: Marriage
FHL Film Number: 1028051

1910 United States Federal Census
Name: Harry S De Moss
Age in 1910: 23
Birth Year: abt 1887
Birthplace: Missouri
Home in 1910: Jim Fork, Sebastian, Arkansas
Street: Burma, Adjocint Midland
Race: White
Gender: Male
Relation to Head of House: Head
Marital status: Married
Spouse's name: Bertie De Moss
Father's Birthplace: Illinois
Mother's Birthplace: Missouri
Native Tongue: English
Occupation: Miner
Industry: Coal Mine
Employer, Employee or Other: Wage Earner
Home Owned or Rented: Rent
Farm or House: House
Able to Read: Yes
Able to Write: Yes
Years Married: 3
Out of Work: Y
Number of weeks out of work: 12
Household Members:
Name Age
Harry S De Moss 23
Bertie De Moss 23
Nannie Young 24
Monnie Young 1

U.S., World War I Draft Registration Cards, 1917-1918
Name: Harry Smith Demoss
Race: Caucasian (White)
Marital status: Married
Birth Date: 17 Jul 1888
Birth Place: Missouri
Residence Place: Johnson, Arkansas

1920 United States Federal Census
Name: Harry S Demoss
Age: 32
Birth Year: abt 1888
Birthplace: Missouri
Home in 1920: Prairie, Johnson, Arkansas
House Number: Farm
Residence Date: 1920
Race: White
Gender: Male
Relation to Head of House: Head
Marital status: Married
Spouse's name: Burtie Demoss
Father's Birthplace: Iowa
Mother's Birthplace: Missouri
Able to Speak English: Yes
Occupation: Miner
Industry: Coal Mine
Employment Field: Wage or Salary
Home Owned or Rented: Rented
Able to Read: Yes
Able to Write: Yes
Household Members:
Name Age
Harry S Demoss 32
Burtie Demoss 32
Harold Demoss 16
Shufford Demoss 14

Arkansas, County Marriages Index, 1837-1957
Name: Harry De Moss
Gender: Male
Age: 30
Birth Year: abt 1891
Residence: Clarksville, Johnson, Arkansas
Spouse's name: Mary Simpson
Spouse's Gender: Female
Spouse's Age: 21
Spouse's Residence: Clarksville, Johnson, Arkansas
Marriage Date: 18 Jan 1921
Marriage License Date: 17 Jan 1921
Marriage County: Johnson
Event Type: Marriage
FHL Film Number: 1027109

1930 United States Federal Census
Name: H S Demoss
Birth Year: abt 1891
Gender: Male
Race: White
Birthplace: Missouri
Marital status: Married
Relation to Head of House: Head
Home in 1930: Madison, Grant, Arkansas
Dwelling Number: 19
Family Number: 19
Home Owned or Rented: Rented
Radio Set: No
Lives on Farm: Yes
Age at first Marriage: 31
Attended School: No
Able to Read and Write: Yes
Father's Birthplace: Illinois
Mother's Birthplace: Missouri
Able to Speak English: Yes
Occupation: Farmer
Industry: Farm
Class of Worker: Working on own account
Employment: Yes
Household Members:
Name Age
H S Demoss 39
Mary Demoss 29
Geneva Demoss 10
John Demoss 4
H S Demoss 2
J C Pemberton 72
Annie Pemberton 56

1940 United States Federal Census
Name: Harry Demass
Respondent: Yes
Age: 22
Estimated birth year: abt 1918
Gender: Male
Race: White
Birthplace: Missouri
Marital status: Married
Relation to Head of House: Head
Home in 1940: Madison, Grant, Arkansas
Street: Gue Thase Road
Farm: Yes
Inferred Residence in 1935: Madison, Grant, Arkansas
Residence in 1935: Same House
Sheet Number: 3A
Number of Household in Order of Visitation: 54
Occupation: Farming
House Owned or Rented: Owned
Value of Home or Monthly Rental if Rented: 300
Attended School or College: No
Highest Grade Completed: Elementary school, 8th grade
Hours Worked Week Prior to Census: 60
Weeks Worked in 1939: 52
Income: 300
Income Other Sources: No
Household Members:
Name Age
Harry Demass 22 [52]
Mary Demass 20 [50]
Greva Demass 19
Johnie Demass 14
Horey Demass 12
Jemmie Demass 6
Delma Demass 5
Joel Demass 3
James Demass 1/12

U.S., World War II Draft Registration Cards, 1942
Name: Harry Smith Demoss
Gender: Male
Birth Date: 17 Jul 1888
Residence Place: Grapevine, Arkansas
Military Draft Date: 1942
Relationship to Draftee: Head
**********************************
1870 United States Federal Census
Name: John Demoss
Age in 1870: 29
Birth Year: abt 1841
Birthplace: Illinois
Dwelling Number: 278
Home in 1870: Rushville, Schuyler, Illinois
Race: White
Gender: Male
Post Office: Rushville
Occupation: Shoe Maker
Male Citizen over 21: Y
Personal Estate Value: 400
Household Members:
Name Age
Peter Demoss 63
Elizabeth Demoss 60
John Demoss 29
Luther M Demoss 27

Illinois, County Marriages, 1810-1940
Name: John Demoss
Event Type: Marriage
Event Date: 1875
Event Place: Adams, Illinoi
Gender: Male
Spouse's Name: Nancy Hazlett
Spouse's Gender: Female
Record Number: 5288

1880 United States Federal Census
Name: Nancy Demoss
Age: 22
Birth Date: Abt 1858
Birthplace: Missouri
Home in 1880: Baker, Linn, Missouri
Dwelling Number: 146
Race: White
Gender: Female
Relation to Head of House: Wife
Marital status: Married
Spouse's name: John Demoss
Father's Birthplace: Ohio
Mother's Birthplace: Ohio
Occupation: Keeping House
Household Members:
Name Age
John Demoss 38
Nancy Demoss 22
Dwight Demoss 2

Missouri, Marriage Records, 1805-2002
Name: T M Matthews
Marriage Date: 13 Aug 1893
Marriage Place: Linn, Missouri, USA
Spouse: Nancy Demoss

This is to verify any information
https://www.familysearch.org/tree/person/details/LT3C-C9T

Information may not be 100% correct. I based information from FS. if anything needs to be corrected please send me a suggestion. Thank you