1. Mafia kills family 1 and family 2 because Mafia.
2. Mafia spares the children of family 1 and family 2 and gives them to family 3. Family 3 is Mafia.
3. Children from family 1 and family 2 grow up with child of family 3. Family 3 is very close with family 4. Family 4 is also Mafia.
4. Male child from family 2 runs away from family 3 as a teen because Mafia.
5. Male now adult from family 2 gets a call after 8 years, from family 1 female and returns home when fat lady from family 3 has accident. Accident presumably caused by Mafia.
6. Male adult can't stay unless Mafia says so because Mafia.
7. Male adult also can't pork female members of family 1, 3 or 4 because rules of Mafia.
8. Mafia determines who can marry who...because Mafia?
9. Female from family 1 is self made and successful in crime doing because piggybacking from Mafia.
10. Male from family 2 wants to be successful as well so he tries to create a porn studio

Maybe that'll impress the Mafia?
11. Male has to meet big Mafiosos to learn if he can stay or be exiled from the state

Rules of Mafia.
12. FBI is "investigating" Mafia.
13. Other shenanigans happening like a cult of losers with shitty tattoos that are lowlife criminals but none of it matters because it's not Mafia.
I think that about sums it up.