The John Corso in my family, was born in 1870 in the town of Trabia, in the Province of Palermo. He came to San Francisco just before the turn of the century. I am aware of another John Corso and some of the members of that family. They coincidentally lived in the same neighborhood as my family. This family apparentyly also came to S.F. around 1900. What I have is pretty sketchy but I may be able to search my notes.