1. Mother's sister
  2. Grandmother
  3. Mother-in-law
  4. Sister of father-in-law
  5. Maternal aunt

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Answer: Option 4

Wife's brother---Brother-in-law. Son of lady's brother is the brother-in-law of the man. So, lady's brother is man's father-in-law i.e. the lady is the sister of man's father-in-law.

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