My sister-in-law has recently started hitting her parents. She hits them hard and without provocation. This is new - she’s been verbally abusive in the past, but has only gotten physical with police or mental health workers who were called to the house in emergency situations. My in-laws are older (mid-70s) and not in great health (especially father-in-law who seems to get the brunt of her hitting) and she is not a small person. We only learned this behavior had started because they came to visit and she hit her dad hard in public. We are concerned that this is getting increasingly unsafe for my in-laws. She has also started calling 911 to make false accusations against her dad and doing things like shutting off power to the house. She refused her last shot so is not currently medicated.
What can we do to keep them safe? Does anyone know why this suddenly started happening? Or have any advice on how to manage this situation? She doesn’t hit them for any reason we can tell - they aren’t refusing to give her something or arguing or anything like that. She’ll just walk up and hit then without any discussion and then walk away.
They refuse to look into alterate care for sister-in-law and can be pretty secretive about any incidents. They told a family member who was there when she called 911 and then later got kicked out the ER because “they won’t come visit us if they know” (which is true because I don’t think she’s a safe person to be around with a newborn and a 2 old, but hiding things like this is dangerous for them and also unfair to us because it doesn’t let us make our own risk assessments for our kids).