Very few sons or nephews have ever eclipsed their elders as far as "success" and "reputation." One I can think of off the top of my head was Rosario Bufalino, who was the nephew of Calogero Bufalino. Another was Stefano Magaddino who was the son of a leader over in Castellammare del Golfo, Sicily. For that matter Joe Bonanno eclipsed his father who was a member of the Trapani Mafia as well. Sonny Franzese gained a higher position than his dad who was a Camorra member. Another one was Paul Castellano who was the son of capo Frank Castellano.

There were others of course. But this is right off the top of my head.