Actually, Vincent was NOT the only 'blood male relative' as Santino had left behind at least one son Frank, probably another (the baby Sandra was carrying at Connie's wedding...was that a boy?), and Connie had two sons of her own.

That's one of the beefs I've always had with GFIII, the fact that they had to fabricate this illegitimate child with little or no reference to the other male heirs in the family. Wouldn't a feud between Sonny's sons or even the cousins have been interesting? Instead, we got a love affair between cousins.

I know Connie told Vincent he was the only one left with her father's strength (another of the few scenes I've seen )...that's because everyone else was written out.

Apple