Wow, Teresa...you certainly have been busy. Seems somewhere along the line there MUST be a connection. The one thing different here is that my grandmothers' maiden name was DiSiena. I do know there were twins boys in her family since my dad talked about twin uncles and Carolinas' sister (married Constanzo) also have birth to twins. My grandfather, Luigi, was born in Corena Aubusone, near Monte Casino of Vincent and Margherita Malogranno. I don't know where Vincent was born yet.
During the 60's, my sister and I did extensive 'name' research back to the year 1106 which then led us to France where we stopped. However, this was not 'family' specific before Vincent.
You are correct in that I need to start writing some letters. I have not been to Italy but Constanzo cousins have brought back beautiful pics and lovely treasures.
Thanks for all the info and good luck to you and Melody in your continuing search.