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Baldamera Lastra Gomez is the daughter of Dionisio Gaspar Lastra Gomez and Esperanza Gomez (1858-1954). Her siblings were Almerida Lastra Gomez (1890-1994), Elvira Lastra Gomez (1896-1969), Araceli Trinidad Lastra Gomez (1904-1994), Manuel Lastra Gomez, Luis Lastra Gomez.
Baldamera Lastra Gomez's husband is Manuel Maza. They had 12 known children named Jose Maza, Gabino Maza, Luis Maza, Antonia Maza, Isidro Maza, Maria Maza, Baldomera Maza, Manuel Maza, Mateo Maza, Alfredo Maza I, Alfredo Maza II, and Esperanza Maza.