I don't know if it ever happened. I'm sure they probably checked to make sure your mother and father were both Italian. It was probably a line added to make Goodfellas more interesting.

They are gonna have to eventually end up mixing things up if they want "their thing" to stay around. The full blooded Italian gene pool is slowly shrinking (as is every caucasian gene pool) as interracial screwing is accepted more and more from the northeast as well as the rest of the country (minus we here in the south).

For instance, I am Half Italian, Half Cajun. If I were to be a criminal, why would I partner up with LCN if I knew they were going to make some borderline retarded person because he has more Italian blood in him than I do? LCN is losing a lot of power in that way in my opinion.