This isn't really a family law question even though it pertains to a family member. I added the tag "Violent Crime" to your question so that the criminal lawyers will see it. They can best comment on this type of criminal behavior.
If my answer was helpful to you, I would appreciate if you would mark it either "helpful" or "best answer" if you feel that applies, as AVVO gives us rating points based on feedback. Thank you! Please note that the above answer is not to be construed as legal advice. It is my personal opinion based on your question, and it was given without obtaining the detailed information that I would normally request in order to render comprehensive legal advice. I advise you to consult with a local attorney of your choosing to obtain specific legal advice. The fact that I answered your question does not create an attorney-client relationship between you and me.
I recommend that you go to your county courthouse and ask for help filing a PFA (Protection from Abuse action). Also, look into counseling for your children.
What you described typically is not categorized as only harassment. The DA can amend it and very well may if you discuss this with them. A restraining order should also be sought.
This is not intended as individual legal advice and there is no attorney client relationship established by this answer. It is advisable that you seek individualized legal assistance. This is not a substitute for hiring an attorney.