Daughter of John Thomas Cooper and Mamie Whitfield Cooper.
Anderson, Grimes, Texas

1920 Anderson, Grimes, Texas
Name: Lillian Cooper
Age: 08
Birth Year: abt 1912
Birthplace: Texas
Home in 1920: Anderson, Grimes, Texas
Race: White
Gender: Female
Relation to Head of House: Daughter
Marital status: Single
Father's Name: John T Cooper
Father's Birthplace: Texas
Mother's Name: Mamie Cooper
Mother's Birthplace: Texas
John T Cooper age 33; Mamie Cooper age 31; Lillian Cooper age 08;
Edith Cooper age 4 6/12. Source Citation: Year: 1920; Census Place: Anderson, Grimes, Texas.

1930 Goose Creek, Harris, Texas census
Name: F Lillian Cooper
Gender: Female
Birth Year: abt 1912
Birthplace: Texas
Race: White
Home in 1930: Goose Creek, Harris, Texas
Relation to Head of House: Daughter
Father's Name: T John Cooper
Father's Birthplace: Texas
Mother's Name: Mamie Cooper
Mother's Birthplace: Texas
T John Cooper age 43; Mamie Cooper age 41; F Lillian Cooper age 18; E Edith Cooper age 14. Source Citation: Year: 1930; Census Place: Goose Creek, Harris, Texas.

1940 Goose Creek, Harris, Texas census
Name: Lillian Duncan
Age: 28
Estimated Birth Year: abt 1912
Gender: Female
Race: White
Birthplace: Texas
Marital status: Married
Relation to Head of House: Wife
House Number: 417 East Hunnicutt Avenue
Inferred Residence in 1935:Goose Creek, Harris, Texas
Residence in 1935: Goose Creek, Harris, Texas
Gordon F Duncan age 32; Lillian Duncan age 28. Source Citation: Year: 1940; Census Place: Goose Creek, Harris, Texas.

Texas, Death Certificates, 1903–1982
Name: Lillian Duncan [Lillian Cooper]
Birth Date: 09 Mar 1912
Birth Place: Richards, Texas
Gender: Female
Race: White
Residence: Beaumont, Jefferson, Texas
Spouse: Gordon Duncan
Father: J T Cooper
Mother: Mamie Whitfield
Age at Death: 62
Death Date: 08 Feb 1975
Death Place: Winnie, Chambers, Texas
Ancestry.com. Texas, Death Certificates, 1903–1982