Good evening... and thanks for contacting JA.
At this point, you need to forego all mental health expertise and make certain that you are protecting yourself and your family.
Please continue to work closely with the police, file appropriate reports with legal authorities, and do not entertain concerns about his well-being.
I understand, quite deeply, how you feel about the need to protect him. But you need to remember what the airline stewards tell you when the plane is going down: "Put the oxygen mask on yourself before you help those around you."
You need to protect yourself with appropriate restraining orders and related legal restrictions to be certain that you (and your daughter-in-law and grand-daughter) are safe.
Once you are guaranteed a level of safety, then you can ask questions about appropiate interventions to address his mental health issues. Right now - you concerns should be about safety.
Please understand that when someone violates your personal rights and safety - these concerns take precidence over other concerns.
I wish you the best of luck - and hope you will take my advice.
Thanks. Please click <ACCEPT> unless you have other questions or concerns.