Perhaps if Alma had dropped a hint to Jr., she might have suspected. Had Ennis ever been able to speak with Jr about his feelings for Jack and his loss after his death, it could have led to a healing for Ennis. But, that is all hypothetical, all we know is that Alma loved her Daddy very much and wanted him in her life. Ennis wanted to be included in his daughter's lives, and we know in the short story in the preamble, Ennis as a much older man speculated after yet one more job had fizzled on him, that he might have to move in with his married daughter (note: married daughter singular not plural, which implies that Jenny had not yet married by the start of the short story). The fact that he would consider moving in with Alma, gives me hope that Ennis had a great relationship with his daughter and his son-in-law, the oil field worker.