Captain's Quarters

In the underworld, there's rumors of "The Captain". They're said to be 10 feet tall and to have a stare that can turn you to stone. Most of the time however, their business is conducted by their "first-mates" and "crew". The thing is, the Captain's Crew is unwaveringly loyal to the cause, and always refuse to give away any information, even under dire circumstances. What could cause such devotion? Just how fearsome is this "Captain", if failing them is worse than death?

(Or the story of how a group of siblings accidentally created an underground mafia held together by love)