Tony DeMonte and Frank DeMonte are another example.
Possible also that Sam Carlisi’s father Giuseppe Carlisi was made (I think it’s certainly possible that he was a Buffalo member who transferred to Chicago, though we don’t know that for sure). I’ve seen some people refer to Jimmy Marcello’s dad Salvatore “Sam” Marcello as a possible member as well. He was at least a criminally active associate, though I don’t think that anything has ever surfaced stating that he was made.
While it clearly wasn’t the norm, it happened more than once or twice. As you already said, they didn’t just make these guys because of who their dads were. Having a father in the family most certainly put them within that inner circle of trust, but these guys still had to have proved themselves in their own right.
Frank “Toots” Caruso, BTW, is the son of a capo (Skid Caruso), the grandson of the preceding capo (Bruno Roti), and cousin of a member (Fred Roti). I also think that Toots’ brother Bruno Caruso could very well have been made. Some people today think that Toots’ son Frankie Caruso is made (I guess he put in work by kicking the shit of Lenard Clark). Wouldn’t shock me if he was, but there’s nothing at all to support that aside from speculation, so far as I know.