So, I started a new game and decided to take
@HopesGaming's words to heart; reading a little closer than I did on my previous play through. Very quickly, hints seemed to start popping out...
So, here's my newest theory:
The MC's father, who left when he was 10, is not the MC's biological dad. Giacobbe is the MC's real father. With Giacobbe and Cordia being friends for so long, I have to wonder if the MC was contracted (by Giacobbe Fazio) to the DeLuca family so the MC might not only learn the "right way" to run a family instead of being influenced by Straffan. It would also remove the MC from his (dangerous?) mother.
As an added bonus,
if the MC were to become romantically involved with one of the DeLuca women (more than likely, either Luna or Gracie) then it could tie both the DeLuca and Fazio families together making both families even stronger.
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There were a few more subtle hints but, not sure if they're applicable here or for another sub-plot concerning the MC's childhood (siblings & friends).