You can't tell if someone is unless they get a professional diagnosis and then she would probably know. You can't walking around telling people that someone is that without being able to back it up medically. It's a serious incurable condition that many have to learn to live with. If he is abusing her you can offer to help her.
She actually did something that makes her one, or he is being hurtful & speaking out of anger.
If you were involved with one and he/she is a chameleon and fools others (only for a short time usually) then worry about getting on with your own life and realizing that others can look after themselves. Sociopath/narcissist will hang themselves every time ... they just have to open their mouths!
Killing of one's husband: Mariticide or viricide Killing of one's wife: Uxoricide
No. Your husband's sister-in-law is either your sister or the wife of one of his siblings. If she is the wife of one of his siblings, she is not related to you.
Just as long as the wife doesn't drink one of her husband's spitters.
No one need tell the ex husband that his ex wife has remarried because it is no ones business. The ex husband and his wife came to an agreement to part their ways and each one is obviously trying to move forward in their life as they should be doing. It is a guess that he will be upset because he has had several years apart from his ex wife giving him the opportunity to try and win her back and it is obvious he didn't care to make that effort. He will find out sooner or later.
Your husband or wife, if you have one.
marriage
Wiband
I'm afraid not, because the wife will have the lingering notion and it will affect her ability to perform to her husband. Two scenario for this one is, if this couple stays together, the wife is the one that will experience the flashback of what her husband did. She will wonder how her husband made love to his affair partner. She will wonder how his affair partner satisfy her husband. This is one thing that most husband who had the affair never thought of, how it will affect and destroy his wife.
It is not legal in Massachusetts for a husband to lock his wife out of their home. One wonders where you got that idea.
There is nothing you can do about it being true if it is so. If an ex husband is truly a sociopath and relations are ongoing, it is imperative that one learn as much as possible about self protection and protection of children/teenagers. Sociopaths vary in their dangerousness to others but are by definition superior manipulators of even the most educated minds.