Look all I'm saying is that there are only suppose to be five New York Families the Corleones were New York based and so were the other four.

The five families are.
1.The Corleone Family
2.The Barzini Family
3.The Cuneo Family
4.The Stracci Family
5.The Tattaglia Family


Much like these real families.

Bonanno
Colombo
Genovese
Gambino
Lucchese