Your husband's brother's wife is your husband's sister-in-law, but is not considered to be related to you.
But I have the same thing, in my family, I consider my husbands, brothers girl friends as my sister, even though we are not really related but we both still say we are sisters!!
so really you can pick if you want them to be your sister, but they will never actually be related to by name, or anything
Its would be your neice
Sister-in-Law
Mom
A hoe.
If remarried, then step-grandma.
aunt
We call "Mami" to moms brother's wife.
probably by her name
sister in law
Brother-in-law
Pick up the phone
Sister In law