To protect the family, start by having family discussions about appropriate boundaries and the importance of privacy. If blackmail threats occur, don't engage with the blackmailer privately. Instead, inform the authorities such as the police or relevant social services. Additionally, it may be helpful to consult with a family lawyer who can guide on the best legal actions to take to safeguard the family's reputation and well - being.
First, encourage open communication within the family so that family members can share if they are being threatened. Then, keep evidence if possible, like messages or recordings. Report it to the police immediately.
One way is to strengthen family unity. A united family is less likely to be bullied. Also, educate family members about privacy and not sharing sensitive information easily. If there are signs of blackmail, seek legal advice right away and don't be afraid to confront the blackmailer in a legal way.