Homosexuality, although deep-rooted, is not too much for God to handle. There is both abundant secular and biblical evidence that homosexuals can change. Then it becomes painfully personal. We couldn't tell anyone. And my wife went into a depression that lasted for months.
All parents make mistakes, and a multitude of complex factors lead to homosexuality.
So it's a mistake for parents to believe that they directly caused someone to become gay. Even if same-sex attractions arise from dysfunctional family patterns, each person makes a conscious choice whether to act out such feelings, or to seek help in overcoming them. One father regrets never being home to help raise his son, who followed a homosexual lifestyle for a number of years. God wants us to turn that burden over to Him. He replaces the guilt with His peace.