If you are close to your step-brother, or to his wife, you can call her your sister-in-law. If you are not close, you can call her your "step-brother's wife."
Derek Huff (Adam Scott)'s wife Alice is portrayed by American actress Kathryn Hahn in the 2008 film Step Brothers.
In Marathi, brother's wife is called 'vayni'
Your brother's wife is your sister-in-law.
they would be called step sisters or step brothers
Your Mother or Step-Mother.
if they are the children of your brother, they would be your nephews and nieces - if they were her children before she married your brother, then step-nephew and step-nieces
step father in law
I think your step grandma.
No, he only has a sister called Tootie.
The second wife to your father if she is not your mother is called your step mother .
step brothers
That would be your great-aunt, by marriage.