Soon he married a young Puerto Rican girl, Jacoba Vicenta Valentín Mendoza from Humacao and had a son whom he named Pedro Julio.

Bosch noticed the natural poetic fiber of the young author, but dismissed the verses saying that the poet, though talented, should "turn his eyes to his country".

Bosch made no immediate remark; however, he had the verses published very soon in his column of the Listín Diario, the most important Dominican newspaper of the time.

It was while living precariously in Cuba that he wrote his famous poem "Hay un país en el mundo" (There is a country in the world).

After Bosch's government was overthrown the same year, Mir, seriously ill, traveled again for a while, though he finally settled with his family in the Dominican capital in 1968, winning the Chair of Aesthetics at the UASD.

His only novel Cuando amaban las tierras comuneras (When They Loved the Communal Land) was published in Mexico in 1978 and has been highly regarded in the Dominican Republic as well as internationally.