My grandmother was Cosima DiBlasi CORSO. She was married to my grandfather Augustino Corso. They lived in Boston (West End) on Norman St. and then Allen St. They had 11 children. The John Corso you mentioned is Augustino's nephew. John's father was Michael Corso, he owned a store and a farm in Oxford, Ohio.
My grandmother's father name was Giuseppe DiBlasi and her mother was Salvatora. I know she had a sister who's name was Antonina and was called Lena.