I have been working on my family tree on Ancestry.com and came across your post on the message board. I think we may have a connection. My great grandmother was Luisa (Luigina) Pirelli (1897-1986), she married Giuseppe Riccobuono (aka Joseph Bruno)(1892-1945). They lived in Milwaukee, WI. I've been told that Luigina had a brother named Dominic (your father??) and her father's name was Ignatius (Ignazio) Pirelli. I was also told that dominic married Rosalia Brillia.
I'm hoping that there is a connection there because I have run into a road block.
Hope to hear back from you!