John,
Here is my email address a.dellagreca@gmail.com
I don't know whether this message will go through because after the first message a few days ago I tried to give you my e-mail and the message disappeared. Maybe I messed up.
At this point I have not been able to establish the relationship, but I may be able to do so in the future, if there is one. Since Luigi's father was Vincenzo and the father of my great grand father was named Giuseppe, potentially they were cousins, but difficult to say since records go back to 1866 only.
Here is something interesting. As I understood it, Luigi & Teresa had four sons Ottavio, Joseph, James, and Vincenzo, plus another you could not find. There was a Vincenzo born 11/19/1866 who apparently died as a baby. Then came another baby, Vincenzo, who is the one you refer to, who was born on 6/5/1868. After that I saw no other children, but there should have been because Vincenzo, named after his grandfather, was most likely the first born and when he died there was a second Vincenzo. I will review my records again and let you know what I find out
Neil