1910 United States Federal Census; Name: Modesta Diaz Y Diaz De Santiesteban; Age in 1910: 26; Birth Year: abt 1884; Birthplace: Puerto Rico; Home in 1910: Caguas Este, Caguas, Puerto Rico; Race: White; Gender: Female; Relation to Head of House: Esposa (Wife); Marital Status: Casado 1 (Married); Spouse's Name: Modesto Santiestevan Y Garcia; Father's Birthplace: Puerto Rico; Mother's name: Sotera Diaz Y Vazquez; Mother's Birthplace: Puerto Rico.
1920 United States Federal Census; Name: Eufemia Diaz Y Diaz; Age: 33; Birth Year: abt 1887; Birthplace: Puerto Rico; Home in 1920: Caguas, Caguas, Puerto Rico; Residence Date: 1920; Race: Mulatto; Gender: Female; Relation to Head of House: Daughter; Marital Status: Widowed; Father's Birthplace: Puerto Rico; Mother's name: Antero Diaz Vazquez; Mother's Birthplace: Puerto Rico; Able to Read: Yes; Able to Write: Yes.
Puerto Rico, Civil Registrations, 1885-2001; Name: Eugenia Diaz Y Diaz; Event Type: Death; Event Date: 29 Apr 1923; Event Place: Caguas, Puerto Rico; Gender: Female; Birth Year (Estimated): 1885; Father's Name: Victor Diaz; Mother's Name: Sobera Diaz; Spouse's Name: Moderto Santiesteban; Volume: Defunciones 1922-1926.