Don't know about actors with mafiosi fathers, there are also cases in which the actors were gangsters themselves:
Louis Eppolito who appeared in "Goodfellas" was a hitman. There is also the Italian actor Giovanni Venosa from the film "Gomorra" who was arrested for being the acting boss for his uncle Luigi Venosa. Another example is the Russian gangster Vladimir Kumarin who played the French king Louis XIV in some movie (don't remember the title).