Hi and I am so sorry.
How old is he? Are drugs involved? Is Son adopted? Did you call CPS for help?
He may need to live outside the home...residential treatment is both mental health and care . My daughter was violent and at 18 we bought her a house just to get her out. That was a terrible idea and didn't work but it tells you how desperate we were.
I think CPS has more services than the police. If son tried to kill you he does not belong in a family setting. The rest of you need protection. And he needs 24/7 treatment. You are not a psychiatrist. This is not your fault but you can't fix him.
Hugs and prayers
