brother in law
you call her your daughter's husband's sister
Your brother would call your husbands sister by her first name. Or, "my (sibling's) sister in law.
Your daughter's husband is your son-in-law.
bhagina
Its would be your neice
Mom
Your sister's daughter is your niece, her granddaughter is your "great niece"... or you could just call her by name.
Let's see if we can unravel this. Your sister's husband's father's brother is your sister's husband's uncle. The uncle's daughter is your sister's husband's cousin. There is no relationship to your sister, unless your sister wants to call her a cousin-in-law. To break it down to its simplest terms: She is your brother-in-law's cousin and no relationship to you.
Well, I call her Abigail, but different strokes, etc.
Your daughter is your sister's niece. Your daughter's son is her great nephew.
You would call your sister's daughter your niece.
Sister-in-Law