Hi everyone, I am using a throwaway due to some friends and family are on reddit. 
My family and I 29F are concerned for the well being of my younger half siblings 12F, 11F, 9F

A few years ago when my younger siblings mother left my father 49M, he seemed to go through the normal grieving, anger, and what not. But after that he seemed to have lost his marbles per say, we chalked it up to him being a single parent with 3 small children. He started to say there were FBI hunting him down, secret agents coming into the home poisioning him at night while he slept. This has gone on for a few years and they moved a few times to different states. Later we found out that they were wanting to take my siblings from him. Side note this is his biggest fear I and two other siblings were taken from him back in the 90's/ early 2000's. 

When he came back with my siblings in  2019 and he came to my house for all of three weeks and I told him he had to go. When he arrived with my sibiling the three of them could not wash themselves, nor do any personal hygiene cause he or my sibilings mother were still bathing them, I got them to the point they were able to shower with little assistance. So he went to his mother 77F and was staying ther with her and her husband. His mother's husband and my father have a very hate filled relationship stemming to my fathers childhood. After staying there for a few months his mother's husband kicked him out for the lack of better terms being crazy. My father continued to say that police are hiding in the trees, the Ninjas are waiting to kill him, they had speical lights they were usimg to burn his skin and calling the marks on my siblings the cause of this light. In this time he and my siblings were sleeping in the livingroom on the floor. Then the responsibilities of parenting went to his mother, putting her under a lot of stress. 

He and my siblings went to the family duplex where his brother was occupying the there side. When he and my siblings moved into the 2 bed 1 bath duplex apartment his paranoia got worse. He says that he hears the FBI under the house. He is shooting bullets into the floor, and at figures he sees at night in the backyard claiming to have shot and killed multiple agents, and there was going to be a raid. He finally broke a few weeks ago and call my siblings mother to come get them why they were on break at school. She did come and get my siblings. I was made very aware of something unimaginable. 2 of the 3 siblings were sleeping with their hands in their underwear cupping their lady bits like they have been hurt. And whenever confronted all three of them shut down. My father states that ghost and demons are raping my siblings. 

Now comes the interesting part, his mother who has had 2 or more strokes since they have come back is in more vulnerable state of mind. He has convinced her that her husband is trying to kill her and is going to sell everything and go against the will. They have separate wills. Yes her husband is a mean old man and they argue like all married couples. But now that she is seeing things that are not there, she has started to go into rages that are frightening. She has broken out windows and is saying the studs and joist are coming out of the floor and walls. She is barricating herself in her room for days on in. Dementia runs in the family so i think that part of the problem. So over this past week i collected enough evidence for her to be taken for a mental evaluation.  She is to be released in a few days. And we will know whats going on. So my father threatened to break into the mental hospital armed to free his mother today. On grounds of kidnapping. When it was a order by a judge. Yes the hospital is on high alert. 

The psychologist called from the ER where they are required to take them first asked about my father and I explained what i have above. They stated they believe my father most likely behind this lapse in mental state and told me to keep him from her.  How do I do this? She is his land lord, mother and enabler. She accepts his behavoir and make excuses for him. I am the offical care taker per. 

So is he endangering my siblings? Endangering himself and others? Endangering his mother?