My mom is suffering from dementia and likes to put the blames on my sister in law. She always claims that she lost her stuff like pants, clothes, handbags and even money. And, my sister in law is always her suspect. it is even getting worse that she scolded my sister in law face to face in front of the kids at home. To the extreme, she even spread it outside of the family. My sister in law is extremely upset. How can we handle this? When it happens, my mom will curse and say she wants to kill my sister in law.