One example of family betrayal by a son could be when a son lies about his family's financial situation to gain something for himself. Coping mechanisms for the family might include open communication. They should sit down and talk about how the son's actions made them feel.
Another form of family betrayal by a son could be when he chooses to side with someone against the family in a conflict without proper understanding. To handle this, the family should encourage the son to see different perspectives. They can share their own side of the story and explain the family values that he seems to be ignoring. This way, the son may realize his mistake and start to repair the relationship.
In some stories, a son might betray the family by revealing family secrets outside. This can cause a lot of damage to the family's reputation. The family can deal with it by setting boundaries and making the son understand the importance of family loyalty. For instance, they can limit the information the son has access to until trust is rebuilt.