A man's sister's husband is his

  • A. brother in law
  • B. father in law
  • C. son in law
  • D. cousin

Explanation

A sibling's spouse is a brother in law or sister in law, and here the spouse is male. A father in law would be the father of one's own spouse, and a son in law the husband of one's daughter. Naming the connecting person before the relationship keeps these straight.

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