The 1896 Iowa Marriage License confirms the following:
[Groom] C. Clayton Carson
[Age at Marriage] 19
[Birthplace] Union, Iowa
[# of Groom's Marriages] First
[Father] Eli Carson
[Mother] Melissa Humphrey
Side Note: For some reason the record's "digital over" indicates her name as Melissa "Campbell". When reviewing the actual record, the record clearly states Melissa "Humphrey"; numerous records confirm her maiden name was in fact Humphrey.
[Bride] Iva M. Mendenhall
[Age at Marriage] 18
[Birthplace] Union, Iowa
[Father] Jacob Mendenhall
[Mother] Sally McCullum
Side Note: Records confirm her to be Sarah L. (McCullum) Mendenhall
[Date of Marriage] 31 March 1896
[Place of Marriage] Union, Hardin County, Iowa
[License #] 283

The 1758 - 1996 Iowa State Marriage Index confirms the following:
[Name] C. Clayton Carson
[Spouse] Iva Mendenhall
[Father] E. W. Carson
[Date of Marriage] 31 March 1896
[Place of Marriage] Union
[Film #] 1547699

The WWI Registration Card (Serial # 97) confirms the following:
[Name] Carey Clayton Carson
[Date of Birth] 24 June 1877
[Nearest Relative/POC] Iva May Carson (Wife)
Side Note: This record is signed "Carey Clayton Carson"

The WWII Registration Card (Serial # U429) confirms the following:
[Name] Clate C. Carson
[Date of Birth] 24 June 1877
[Birthplace] Union, Iowa
[POC] MRS Iva M. Carson (Wife)
Side Note: This record is signed "Clate C Carson"

The 1880 US Federal Census record for Grant, Hardin County, Iowa confirms the following:
[1] Head of House: Eli W. Carson
[2] Wife to Head of House: Melisse Carson
[3] Household Members & Relationship to Head of House (per Block-8):
[3a] Charles Carson (Son), Retta Carson (Daughter), Edwin Carson (Son), Nettie Carson (Daughter), Herbert Carson (Son), "Clayton" (Son), and Jessie (Daughter).
Side Note: Records confirm Retta's given name was Lauretta, and Nettie's given name was Antoinette.
[3b] Mary Batta age 64 is also listed, her relationship indicates that she was the mother to Eli W. Carson; records confirm his father was Jesse B. Carson b. 1809 - d. 1846; after his death Mary remarried.
[4] The census record support birthyears and birthplaces for the listed household members; in particular for Clate:
[4a] Birthyear: Block-6 (Age at Last birthday) confirms he was 2-years old, the census is dated 1 June 1880 (prior to his known/documented birthday), the record reflects his age correctly and supports his 1877 birthyear.
[4b] Birthplace: Block-24 confirms that he was born in Iowa.
[5] Lineage: Block-25 (Father's Birthplace) indicates Indiana (which matches Block-24 for Eli's birthplace). Block-26 (Mother's Birthplace) indicates Ohio (which matched Block-24 for Melissa); this information becomes pertinent for lineage verification in later census records and matches their birthplace indication within their memorials.

The 1900 US Federal Census record for Union, Hardin County, Iowa confirms the following:
[1] Head of House: Clayton C Carson
[2] Wife to Head of House: Iva M Carson
[3] Household Members & Relationship to Head of House (per Block-4): Bessie Carson (Daughter)
4] The census record support birthdates and birthplaces for the listed household members; in particular for Clate:
[4a] Birthdate: Unlike other census, the 1900 census documented the actual Birth Month and Birthyear, for Clate "June" "1877" is indicated.
[4b] Birthplace: Block-13 indicates Iowa.
[5] Lineage: Block-14 (Father's Birthplace) Indiana, Block-15 (Mother's Birthplace) also list Indiana (incorrectly).
[6] Block-10 (Number of Years Married) for both indicates "4-years" which confirms that that their year of marriage was "1896".
[7] Block-11 (Number of Children) and Block-12 (Number of Living Children) pertained to Iva M. Carson, in both blocks "One" (1) is indicated.

The 1910 US Federal Census record for Bangor, Marshall County, Iowa confirms the following:
[1] Head of House: Clayton C Carson
[2] Wife to Head of House: Iva M Carson
[3] Household Members & Relationship to Head of House (per Block-4): Bessie Carson (Daughter), Wendell Carson (Son), and Mildred Carson (Daughter)
4] The census record support Birthyears and birthplaces for the listed household members; in particular for Clate:
[4a] Birthyear: Block-7 (Age at Last Birthday) indicates Clate to be 33-years old, this targets his birthyear to 1877.
[4b] Birthplace: Block-12 indicates Iowa.
[5] Lineage: Block-13 (Father's Birthplace) Indiana, Block-14 (Mother's Birthplace) Ohio.
[6] Block-9 (Number of Years Married) for both indicates "14-years" again, confirms that that their year of marriage was "1896".
[7] Block-10 (Number of Children) and Block-11 (Number of Living Children) pertained to Iva M. Carson, in both blocks "Three" (3) is indicated.

The 1920 US Federal Census record for Felix, Grundy County, Iowa confirms the following:
[1] Head of House: Clayt C Carson
Side Note: The above reflect the indication of his name/variation.
[2] Wife to Head of House: Iva M Carson
[3] Household Members & Relationship to Head of House (per Block-6): Bessie Carson (Daughter), Wendell Carson (Son), and Mildred Carson (Daughter)
4] The census record support Birthyears and birthplaces for the listed household members; in particular for Clate:
[4a] Birthyear: Block-11 (Age at Last Birthday) indicates Clate to be 42-years old, the census is dated 2 January 1920 (prior to his known/documented birthday), the record reflects a correct age for the time and supports his "1877" birthyear.
[4b] Birthplace: Block-19 indicates Iowa.
[5] Lineage: Block-21 (Father's Birthplace) Indiana, Block-23 (Mother's Birthplace) Ohio.

The 1930 US Federal Census record for Torrington, Goshen County, Wyoming confirms the following:
[1] Head of House: Clayton C Carson
[2] Wife to Head of House: Iva M Carson
[3] Household Members & Relationship to Head of House (per Block-6): Mildred Carson (Daughter)
4] The census record support Birthyears and birthplaces for the listed household members; in particular for Clate:
[4a] Birthyear: Block-13 (Age at Last Birthday) indicates Clate to be 53-years old, the record targets his birthyear to "1877".
[4b] Birthplace: Block-18 indicates Iowa.
[5] Lineage: Block-19 (Father's Birthplace) Indiana, Block-20 (Mother's Birthplace) Ohio.
[6] Block-15 (Age at First Marriage): For Clate the record indicates 19-years old, for Iva the record indicates 18-years old (this information matches that of their Iowa Marriage License).

The 1940 US Federal Census record is also for Torrington, Goshen County, Wyoming. This record list only Clate as "C. C. Carson" with his wife Iva Carson. The record confirms that he was born in Iowa (Block-15) and confirms his age to be 62-years old (Block-11), the census is dated 2 April 1940 (prior to his known documented birthday) which supports his 1877 birthyear.

The 1950 US Federal Census for Seaside, Monterey County, California confirms the following:
[1] Head of House: Clate C Carson.
[2] Wife to Head of House: Iva M Carson
[3] Household Members & Relationship to Head of House (per Block-8): Wendell M. Carson (Son)
4] The census record support Birthyears and birthplaces for the listed household members; in particular for Clate:
[4a] Birthyear: Block-11 (Age at Last Birthday) indicates Clate to be 72-years old, the census is dated 26 April 1950 (prior to his known/documented birthday), the record supports a correct age for the time and his "1877" birthyear.
[4b] Birthplace: Block-13 indicates Iowa.
[5] Marital Status: Block-12 for both Clate & Iva confirm that they were married.

The US Department of Social Security provides several records confirming the following:
[SSN] While these public records contain the full SSN, I do not disclose the full number; I will confirm that the last four xxx-xx-7894 match on all the records, confirming that the records are linked to the same individual.
[Name] Carey Carson/Carey Clayton Carson
[Date of Birth] 1877/June 1877/24 June 1877
[Birthplace] Iowa
[Father] Carson
[Mother] Humphrey
[Date of Death] 1977/April 1977
[Place of Death] California
[Last Residence] Lindsay, Tulare, California
Side Note: One (1) record list spouse "Iva M Mendenhall" and another record list spouse "Iva M Mendenhall", child "Bessie L Obryon"
Side Note: Records confirm that Bessie L. Carson married Clifton W O'Bryon 13 November 1920 (which explains why she no longer appeared in the census records after 1920).

The 1940 - 1997 California State Death Index confirms the following:
{Name] Carey C Carson
[SSN] xxx-xx-7894
Side Note: This record also contains the full SSN, matching those as indicated in the above Dept. of Social Security Records.
[Date of Birth] 24 June 1877
[Birthplace] Iowa
[Date of Death] 18 April 1977
[County of Death] Tulare