Many thigs should be done before it escalated to this level.

 this level.

The father should take major role to protect his wife, the action itself teaches the boy how to be a good husband and father.  When the boy shows disrespecting behavior toward parents, it need to be addressed seriously at early stage.  Family and individual counseling would be the top option. When the boy's negative emotion is too intensive, the parents should call for physical isolation on both sides to cool off. It protects both parents and the kid.

If it's necessary, to get police involved is still better than doing nothing.

i know a well known educator who refused to bail his adult child out jail ( drug abuse problem), for teaching purpose.