How is my only sister's husband's wife's mother's husband's mother-in-law's only daughter's mother-in law related to me?
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Your sister's husband's wife is yet your sister.
Your sister's mother is your mother.
Your mother's husband is your father.
Your father's mother-in-law is your mother's mother.
Your mother's mother's daughter is your mother.
Your mother's mother-in-law is your father's mother.
Your father's mother is your grandmother.