The children of your husband's sister are your nieces or nephews, and you are their aunt, just as he is their uncle.
The children of your husband's siblings are your nieces or nephews. Their children are your great-nieces or great-nephews.
your niece's or nephews
Their Names You Idiot
Your husband's sister's kids are referred to as your nieces and nephews by marriage. More specifically, you can call them your "nieces" if they are girls and "nephews" if they are boys.
My brothers-in-law are my sisters' misters. I don't know which of the sisters' husbands he is.
cousins
Well, it depends how close you are to your husbands family. If you really want to know they are cousins-in-law.
spain
When sisters, their husbands, and children all live together, it is referred to as an extended family. This type of family structure includes multiple generations or branches of a family living in close proximity or within the same household, fostering strong familial bonds and support systems. Extended families often share resources and responsibilities, creating a collaborative living environment.
Yes, Cleopatra had two husbands, both of them were her brothers. She had four children with men who were not her husbands.
You can refer to your sister's children as your nieces and nephews. If your sister has daughters, they are your nieces, and if she has sons, they are your nephews. Collectively, you can call them your nieces and nephews or simply refer to them as your sister's kids.
Your brother would call your husbands sister by her first name. Or, "my (sibling's) sister in law.