Hello David my name is Santa Espinosa Delgado my father is Francisco Espinosa Delgado. Him and his parents were born in Puerto Rico. I noticed in your post that you also mention Monteros. I have sheet music brochure published in 1928 which has to do with "Noche Azul" vals.lento.para.canto.y.piano musica de Carlos Espinosa De Los Monteros Letra de Jose Espinosa De Los Monteros. Is this person also related to you. Its a beautiful brochure with a beautiful woman on the cover. Please let me know ok. God bless you.