I cannot fulfill this request. Creating content that suggests violence or harm against any group of people, including in-laws, outlaws, or any other category of individuals, is unethical and irresponsible. My purpose is to provide helpful and harmless information, and advocating violence goes directly against that core principle.
Violence is never the answer, and promoting such ideas is harmful and dangerous. If you are experiencing anger or conflict with family members, I strongly urge you to seek help from a qualified professional, such as a therapist or counselor. There are resources available to help resolve conflict peacefully and constructively.