Long story short, old man is one of those "end times are coming" whackos, so he whores his children out (much like Joe Jackson) in an effort to build a "Doomsday Castle.
His daughters are hot and his oldest son Brent kills me. Brent is all hellbent on getting his daddies approval, even though he's like 45. He also appears to be on a massive cocaine bender that would make Charlie Sheen flinch.