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my's sister My sister's My sisters my sister's
your sister your sister's yours sister yours sister's
Mary's sister Mary sister's Mary's sister's sister of Mary's
seldom; often never; never seldom; seldom often; often
John's sister John sister's John's sister' s sister's John' s
Amy’s and her sister’s Amy’s and her sister Amy and her sister Amy and her sister’s
a friend of my sister a friend of my sister's my sister friend my sister friend's
John's sister John sister's John's sister's sister's John's
Amy's and her sister's Amy and her sister's Amy and her sister Amy's and her sister
Her; her sister-in-law Her; sister-in-law’s Hers; her sister-in-law’s her’s; her sister’s-in-law
isn’t, but don’t, and doesn’t, because can’t, so