If you had one child that was a danger to your other children what would you do?

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i watch (as i mentioned in another discussion) a thing about kids with schizophrenia and some were very violent and had tried to kill their siblings (literally) and threaten to kill their parents.. now im not trying to give schizophrenia a bad name just that was what the documentary was about lol.. but if you had an unstable child (for whatever reason whether its mental illness or just the kids just has anger problems) and has tried to kill their siblings and you or has hurt them and seems to be esculating what would you do? i mean sure you dont want to send the one away with the issues but then again keeping them around and not watching them 24/7 could end up killing one of your other children, pets, or you... what do you think wold be the best option? and you had already done the therapy and medications route with no real help.. would you protect yourself and other children and pets or try to figure out a way of having security around that one child more to where they wouldnt have to leave?