But there was a price for this information , Jack wanted 10 % of Ewing Oil .
Jamie 's brother , Jack , came to Dallas and went to J.R. to reveal that he had proof that Ewing Oil was owned outright by Jock Ewing .
There was a price for this information , Jack wanted 10 % of Ewing Oil .
Jamie 's brother , Jack , came to Dallas and went to J.R. to reveal that he had proof that Ewing Oil was owned outright by Jock Ewing .