One thing that I was a little bit surprised, with the aftermath of the Ombra Family Stealth mission (aka "Eiza's sister rescue mission):
But it's not stated that he's part of the Family. Who he is, is left very ambiguous (if I'm remembering that contract correctly). While it could be possible he could be like Vincent (retired Capo who we see in Isabel's event), nothing is confirmed yet.
There's a chance, he could be a part of DeLucas, but there's also chance he could be not.
The 5 that I listed, are basically confirmed DeLuca Family members, who are also confirmed to know everything about the MC.