So how will they live on?

They will probably divorce eventually since neither one seemed willing to be completely honest with each other and I don't see them ever being completely honest. At one point, she wanted him to be honest and tell her want they did to him over there but she wasn't completely honest with him telling him, when he asked about her and his brother, that "we kissed, that's it" especially after such a long pause before answering. She should have been completely honest and told him... "So Your ex-con tattooed brother and I were sitting alone on the floor one evening in our house in front of the fireplace with lit candles and music playing just talking while drinking beer and smoking weed. Then he leaned in to kiss me and we kissed quite passionately for a moment before I stopped because I felt bad and confused. I thought you were dead and, after all, your brother and I were getting along pretty well and the kids loved him." So if she was unwilling to tell him the whole truth why expect him to tell her?

I think there were too many clues that something else was going on between her and his brother that never would be resolved; even with psychiatric help. When he first asked his brother if he slept with his wife, he never answered the question. At the dinner table when the older daughter says that her mom and Tommy sleep together all the time, there's only silence after the mother tells her sternly "enough". No one immediately says anything about it not being true? The daughter apparently lied, but having said such a thing, shouldn't she have had the daughter tell him that it was a lie? She just stands there letting him destroy the kitchen with a stupid look on her face without trying to convince him that she didn't sleep with his brother? The brother then shows up and walks into the house unannounced like it's his place? Think about it, he knows his brother much better than his wife and why would she have feelings for someone completely opposite of him. Knowing his suspicion of something between his wife and his brother along with his fragile mental health why did she continue to allowed his brother to come over to the house? If I were him, after everything had settled, I wouldn't want anything more to do with either one of them just for my own mental health.