My brother had him listed as Rex Lyle, likely from my mother's memory. But all documents I find point to Rex Charles Duncan or Rexey as a 9 year old on the 1900 census.
Name: Rex Charles Duncan Event Type: Draft Registration Event Date: 1917-1918 Event Place: Jefferson County, Montana, United States Gender: Male Nationality: United States Birth Date: 16 Feb 1891 Birthplace: Demoines, Iowa, United States Affiliate Publication Number: M1509 Affiliate Publication Title: World War I Selective Service System Draft Registration Cards GS Film Number: 1684041 Digital Folder Number: 005241963 Image Number: 02667
Citing this Record: "United States World War I Draft Registration Cards, 1917-1918," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K8Q6-8LT : accessed 15 May 2015), Rex Charles Duncan, 1917-1918; citing Jefferson County, Montana, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,684,041.
Age: 72 Given Name: Rex Middle Name: Surname: Duncan Name Suffix: Birth Date: 16 Feb 1891 State: Montana Last Place of Residence: Previous Residence Postal Code: Event Date: Dec 1963
Citing this Record: "United States Social Security Death Index," index, FamilySearch (https://familysearch.org/ark:/61903/1:1:JLTT-ZPT : accessed 15 May 2015), Rex Duncan, Dec 1963; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
Name: Rex C Duncan Titles and Terms: Event Type: Census Event Year: 1930 Event Place: Eureka, Jefferson, Montana, United States District: 0022 Gender: Male Age: 39 Marital Status: Married Race: White Race (Original): White Relationship to Head of Household: Head Relationship to Head of Household (Original): Head Birth Year (Estimated): 1891 Birthplace: Iowa Immigration Year: Father's Birthplace: Tennessee Mother's Birthplace: Tennessee Sheet Number and Letter: 1A Household ID: 3 Line Number: 10 Affiliate Name: The U.S. National Archives and Records Administration (NARA) Affiliate Publication Number: T626 Affiliate Film Number: 1257 GS Film number: 2340992 Digital Folder Number: 004610689 Image Number: 00557
Household Role Gender Age Birthplace
Rex C Duncan Head M 39 Iowa
Gena F Duncan Wife F 38 Montana
Geraldine M Duncan Daughter F 12 Montana
Rex M Duncan Son M 7 Montana
Elizabeth A Steed Boarder F 23 Montana
Citing this Record: "United States Census, 1930," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XCMG-R2L : accessed 15 May 2015), Rex C Duncan, Eureka, Jefferson, Montana, United States; citing enumeration district (ED) 0022, sheet 1A, family 3, line 10, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1257; FHL microfilm 2,340,992.
Name: Rex C Duncan Titles and Terms: Event Type: Census Event Date: 1940 Event Place: Election Precinct 19 Hillsdale, Gallatin, Montana, United States Gender: Male Age: 49 Marital Status: Married Race (Original): White Race: White Relationship to Head of Household (Original): Head Relationship to Head of Household: Head Birthplace: Iowa Birth Year (Estimated): 1891 Last Place of Residence: Same House District: 16-21 Family Number: 25 Sheet Number and Letter: 2A Line Number: 34 Affiliate Publication Number: T627 Affiliate Film Number: 2220 Digital Folder Number: 005461688 Image Number: 00439
Household Role Gender Age Birthplace
Rex C Duncan Head M 49 Iowa
Zena F Duncan Wife F 48 Montana
Geraldine M Duncan Daughter F 22 Montana
Rex M Duncan Son M 17 Montana
Citing this Record: "United States Census, 1940," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VBQ9-Q8S : accessed 15 May 2015), Rex C Duncan, Election Precinct 19 Hillsdale, Gallatin, Montana, United States; citing enumeration district (ED) 16-21, sheet 2A, family 25, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 2220.
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