In the 1930 US Census for District 12, Precinct 11, Mora County, New Mexico the family of Filemón Fernández was enumerated with the family of Filemón's father, as follows:
Dwelling #29; Family #36
Fernandez, Filemon; Head; Rents farm home; M; W; 26; Married at age 23; Can read and write; b. New Mexico; Both parents b. New Mexico; Farmer; Farm; Works for own account; Employed full year; Non-veteran; Farm Schedule #14
Fernandez, Zilla B.; Wife; F; W; 26; Married at age 23; Can read and write; b. New Mexico; Both parents b. New Mexico; No occupation
Fernandez, Ernesto; Son; M; W; 2-2/12; Single; b. New Mexico; Both parents b. New Mexico; No occupation
[Note: Filemón was a brother of Tranquilino Fernández, husband of Martha Barnum].