We speak of Ennis compartentalizing his life or at least his feelings, when Jack actually did it. He lived three lives, Texas, Ennis, and LF, and none of them met at any point until his death. Ennis was the focal point. Jack parents knew of Ennis, and the relationship they had, Lureen knew that this man her husband would meet once or twice a year for twenty years was significant person in his life. But the interesting part of this trio is that Jack never brought Lureen to meet his folks, they never saw their grandson and would probably never will. Lureen left it up to Ennis relay the message of Jack wishes of where his ashes to be placed.
Ennis was the only real part of Jack's life, and in a way Jack parents and Lureen knew it.