Most parents harbour some guilt when they find out about a gay offspring. Let's face it, most still think that it is such a pity that their child is gay. They blame themselves and think about what they could have done differently. For Buddhists, this guilt is further enshrined in the concept of Karma. Apart from the normal parental guilt, Buddhism hints that any problems with children could be attributed to the parents' wrongdoing.
Many parents blame themselves for any misfortune that occurs to their children.
Unfortunately, being gay constitutes one of these misfortunes. My mother felt this burden. It is very hard to change a lifetime of beliefs. She blamed herself and thought that my being gay was to do with something she had done. She did not tell anyone about it at the time.