This is a discussion on the RealDeal forum as well, where Gangster BB poster Sonny_Black pointed out there the possible connection between the missing Giuseppe Renda and Sciascia.

I pointed out that the journalist may have made a mistake when stating that the missing Giuseppe Renda is not related to Paolo Renda, as The Sixth Family states that Gerlando Sciascia had a nephew named Luciano Renda who is related to Paolo.