The Fourth Son

S4, E7: The sinking of an oil tanker and the loss of 600,000 gallons of crude oil has J.R. delighted, but to Bobby it's only a minor inconvenience until he discovers that the oil was not insured and the loss could total over $18,000,000 for Ewing Oil. At the ranch Ray greets a very unwelcome guest, his father, Amos Krebbs, whom he hasn't seen or heard from since he was 3 and who has some very disturbing news for the entire Ewing family.