A few weeks ago, there was a string going on about the nationality of the Castanza's. Please forgive me if this point has already been raised, as I have been away for a few weeks. But...
In the calazone episode, which aired last night, George tells the owner of Pizzano's, that his "... last name is Castanza, which is Italian, so that almost makes us "pizzan" (I believe that means family??)
Anyway, would it not be safe to assume that if their last name is Italian, so are they???
Just a thought.