This is not the "Brother Factor"....but its similar......
I've written here before that my father was gay, and he had a partner for 14 years. The main reason they split, was due to Allen (Dads partner) meeting up with a penfriend from overseas, and deciding he wanted to marry her. His new wife was aware of his relationship with Dad.
They married, and had two sons. When the youngest son was 16, he came out and announced he was gay. At that time, there had been no open discussion with him about his father's previous gay life. Obviously, afer the son came out, his father "confessed" to his own experiences and showed him plenty of understanding and encouragement. It took a short time for his mother to come to terms with it. The older brother, didn't want to talk about it, did not want to know about his father and alienated himself from his brother for some time, but eventually rekindled the relationship, but still prefers not to talk about it with any of them.The older brother is straight, married with kids. Allen said that he had seen the signs in his young son, and was not surprised when he finally told them he was gay.
I had lost contact with Allen, after my father died, for a period of over 20years. After I saw Brokeback Mountain, I did a search on the Internet, and found him, contacted him, and because he only lives a couple of hours from me, visited him and his wife. He talks to me very openly about his relationship with Dad, about his own family situation and his sons. He is over 60 now, still married (over 30yrs), but told me that he still considers himself as gay, that even though, for the past 30 years on the outside he looks like an average straight husband and father, inside, he is still a gay man and that his wife understands and accepts that. I do not know how he controls that or manages that, or if he has been "actively" gay.
Complicated......thats for sure......but the family, (once all the dust settled) remain a close family. The boys are in their mid to late twentys now, The gay son is in a permanent relationship, the eldest son is married with two children, but he has battled alcoholism and a few other social problems. The family have helped him deal with his problems and they all visit each other regularly and maintain close committment to one another.