Domestic violence in the “tooth”... is this a thing?! - yes it is, sadly.
Domestic violence happens in families of all backgrounds. It happens among atheists, among religious people, etc.
It can be men on women and women on men.
It happens among gay couples, too.
I don't know whether there are higher or lower level of domestic violence among JWs, or whether that even matters.
But it's a sad and illegal thing that needs tackling.
what advice could you give me in helping someone that is a Jehovah witness, married with another jw but lives a marriage that is plagued by emotional domestic abuse and financial control? - I'm not sure. How bad is the domestic abuse? Does it include physical abuse?