My BiL is a complicated person. He doesn't want to see anyone, especially since lockdown. He has been physically and psychologically abusive to his partner, physically shoving and hitting. He also generally hates everyone and everything. His brother, my husband, is a gem and won't speak any ill against him. But frankly, I am concerned about his partner (who is having a mental breakdown over his behaviour) and his lack of concern and emotion towards his blood family. We all think he has a narcissistic personality. How do we all move forward as a family?