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Dionisio Gaspar Lastra Gomez is the son of Juan Lastra Gomez and Maria Gomez Ruiz.
Dionisio Gaspar Lastra Gomez's wife was Esperanza Gomez (1858-1954). They were married. They had six known children named Almerida Lastra Gomez (1890-1994), Elvira Lastra Gomez (1896-1969), Araceli Trinidad Lastra Gomez (1904-1994), Manuel Lastra Gomez, Luis Lastra Gomez, and Baldamera Lastra Gomez.