honeykins
probably by her name
just call her by her first name, she is no relation to you.
You should call her by her first name. You may refer to her in third person as your sister-in-law.
his name or brother-in-law
Calling her by her name would be okay. Ask her what she likes better.
In the English language there is no difference between the wife of an elder brother and the wife of a younger brother or of a twin brother. The wife of any brother is your sister-in-law. If you are actually talking to her, however you should just call her by her name. Nicknames are fine too.
You cant really call them if your meaning something else but if you mean whats her name what people should call her is Mrs Claus
my wife who died
Have to, no. Call her by her first name. It is what i do.
I think you should address her by her name. She is no relationship to you, but you would introduce her as your nephew's wife.
Your wife's brother is your brother-in-law.
There is no specific name for Yogi's wife, but we call female yogi as "Yogin'