Paternity Suit

S3, E17: After Cliff Barnes announces he is quitting the race for Congress, Digger returns to the bottle and drunkenly tells a reporter that Cliff is really the father of Sue Ellen's baby. Jock Ewing insists the family sue Cliff, who countersues for custody of his son forcing Sue Ellen, J.R., and Cliff to take blood tests to prove once and for all who is the baby's real father.