<human>: Give me a shortened version of the text

I'm not sure if "legal advice" is the right thing I'm looking for, but perhaps people with experience in these sorts of cases could shed some light on our options.

My fiancee's dad has slowly become more and more mentally ill over the past 5-10 years. At first it was irrational screaming over minor issues, but it progressed to him isolating her, accusing her of ridiculous things (orgies as an example), and culminated in him hitting her for the first time on Monday this week. She has a concussion, cuts on the inside of her mouth and a very bad black eye.  He was arrested but then released on bail the next day, only to go straight back to the house, get arrested again, and promised the police "I'll just keep going back to the house no matter how many times I'm arrested!" He was released again today and my mother in law is terrified and can't go back home while he's loose.

He's dangerous to his family and possibly to anyone around him, yet the police have basically said there's nothing they can do. They say it's likely he'll get no jail time, and in the mean time he's spending the family's money to bail himself out and who knows what else. 

Is there really no forced institutionalization in Canada? The police are suggesting her family seeks treatment on their own, but there's absolutely no way that's possible. We think he has Alzheimer's because he doesn't remember any conversations you have with him, alongside schizophrenia to explain his paranoia and erratic personality, however, he refuses to seek any help and goes absolutely crazy when it's even hinted at (he thinks mental institutions are torture chambers).  On top of this, he's Korean and doesn't speak much English. 

Is there any procedure in place for this sort of thing? It **blows my mind** that the police are letting this dangerous man out when he promises he'll go back to his family. He's displaced his wife, 2 kids, and they're all terrified to go back home.
<bot>: fiancee's dad is EXTREMELY mentally ill and dangerous, yet keeps being released. What can we do to force him to get treatment and stop ruining their lives?