Pleased to 'meet' you. It is exciting isn't it! The Gizzi family are certainly spread around the world. I have a few different connections on my tree into the Gizzi family. My main link is through my great great great grandmother Serafina Carmina Gizzi born 1841, who according to my computer is Vincent's third cousin twice removed. (I'm glad the computer worked that out because I think I would have struggled!) I also have an interest in Vincent's father Michele due to an incident which was very well hushed up in my family. A skeleton in our closet!! Does Vincent recall his father ever having mentioned being stabbed in the leg at a wedding in Glasgow in 1890? If so I know who the perpetrator was - his cousin Loreto (Serafina's son) who was my great great grandmother's older brother. I found Loreto on a census in 1901. The secret had been so well hidden by the family that my grandmother thought her grandmother had been an only child. I have lots of the court papers and newspaper reports from the time.
The Gizzi's were from a small town called Picinisco. A wonderful gentleman by the name of Michel Vacca of Belgium has been putting together the genealogy of the town and he is very generous with his data. Through him I have details of this line back to the start of the 1600s. The website is here http://www.picinisco.net/index.php
Its defintiely worth a visit and you can post there too.
Anything I can help with just ask. Its great to have amassed all of this data and to be able to share it with someone who understands the excitement!