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Luis Lastra Gomez is the son of Dionisio Gaspar Lastra Gomez and Esperanza Gomez (1858-1954). His siblings were Almerida Lastra Gomez (1890-1994), Elvira Lastra Gomez (1896-1969), Araceli Trinidad Lastra Gomez (1904-1994), Manuel Lastra Gomez, Baldamera Lastra Gomez.