When Ladislao Alves da Costa Daleira was born on 3 September 1909, in Seccion 12, Cerro Largo, Uruguay, his father, Martiniano Alves da Costa, was 40 and his mother, Criselda Daleira, was 40. He married Dacila Abreu Rodríguez in 1939, in Cerro Largo, Uruguay. They were the parents of at least 1 son and 1 daughter. He died on 28 August 1971, in Melo, Cerro Largo, Uruguay, at the age of 61, and was buried in Melo, Cerro Largo, Uruguay.