[/QUOTE]Researcher, let me tell you what it was all about: $$$$$$$$$$$$$$$$$$$$$$$$$$$.

Mike & Vito weren't concerned about manners, they were concerned about dollars and cents. At the time it wasn't in the best interest (read: financial best interest) of the family, so Mike refused. Period. [/QB][/QUOTE]

I do actually know that, but with the Don there would be a respectful motive involved. With Michael, probably not, he's more business like. But disallowing them to form their own families could easily generate dislike in Tessio and Clemenza, which would be very bad for financial relations between the two.