Your sister-in-laws are your sisters by law after marriage. They are either your spouse's sisters, or the wives of your brothers. Their relatives are not related to you, although some of them will be related to your children.
No. Neither is your cousin-in-law, or her sisters. In-laws are not blood relative (i.e., members of your family or lineage) therefore anyone related to an in-law is not a relative.
SHe's your relative by virtue of her sister being married to your brother.
You mother's sister is your aunt, but a god daughter does not have to be a blood relative. If that's the case, there's no special word for what you're doing.
yes...
They mean it is illegal to have a child with a first relative such as a sister or even a mother. What they exactly are though depends on a state by state basis.
Your sister in law is your husband's sister or your brother's wife.
Yes, she is your sister-in-law.
Yes. She is your sister through your brother or sister.
Yes, I suppose that they would be sister-in-laws. Because your sister is your husband's sister-in-law, and the other sister is his sibling, then I suppose they would be sister-in-laws.
Your Sister In Laws parents will be your Mother and Father In Law.
Before or after a divorce a step-sister is not considered a legal relative in most jurisdictions.
Your sister's daughter is your niece. Your sister's daughter's son (your sister's grandson) is your great nephew.