Francisco Mamerto Reynoso was born in Palmarito near Salcedo, Hermanas Mirabal Province, Dominican Republic, on 8 May 1914 (claims 22 March 1911). His father, Apolinar, had 33 children in total from different marriages – Francisco was the first of nine children from one of his father’s marriages.

Around 1940, he married Aurelia Almánzar, whom he met while attending the Santa Eduvigis festivities in El Algarrobo, Moca. The couple had 12 children. He supported his family by working in agriculture.

Reynoso currently lives in Palmarito near Salcedo, Hermanas Mirabal Province, Dominican Republic.