It’s understandable that you want to protect the potential future family of your daughter’s abusive ex, but it’s important to consider the possible consequences of your actions. Before doing anything, it’s important to evaluate whether it is safe for you to speak out and if the information you have is accurate and can be proven. If you believe it is safe and necessary, you may want to reach out to the bride’s family and provide them with factual information and documentation about your daughter’s experiences with the ex. However, it’s important to approach the situation delicately and with empathy, as they may not be receptive to the information or may not believe it. Consider seeking the advice of a trusted friend, family member, or professional before taking any action.