You have to feel for Alma when she opens the door and sees Jack and Ennis deep into each other with a passion she knows doesn't exist with her and Ennis. Her portrayal of a women being left behind as she closes the door and walks back into the room is outstanding. At the very outset, I believed she loved Ennis, but it soon gave way to nagging (she tried ever ploy to get her way, the kids don't have anyone to play with, she was fearful of the daughters asthma attacks), in truth she just wanted to be in town, tired of the damn lonesome ranches. Funny thing, once she got to town she wasn't satisfied either. She had even staked out the apartment before hand. She forced Ennis into doing work he didn't want to do, wasn't meant to do. When she confronted Ennis later on at the Thanksgiving table, I wanted to smack her.
Lureen on the other hand became the business woman, because Jack wasn't the prototypical business man. Neither wanting to take care of family issues as evidenced by the lack of tackling the school issue for Bobby. I think Lureen loved Jack, but he grew apart from her, for a reason she couldn't perhaps know or understand. If you remember in the scene at the dinning room table, she was dressed more simply, smiled when Jack actually told her old man to sit down you S.O.B. before I knock your ignorant a$$ down. The next time we see her is with Randall and LaShawn, she fried out. Lots of makeup, lots of Jewelry, Lots of hair. It was the Big 80's I realize and Dallas was in full swing, but my gawd. Then at the end, we see glimpses that she still loved Jack, even though she was cold as ice to Ennis.
Frankly, Lureen just shoulda had an affair with LaShawn, she would have been better!