What do you call a person who is married to someone of the same sex?

Answer 1

If a man is married to a man, then each is the husband of the other. If a woman is married to a woman, then each is the wife of the other. Their relationship is called a marriage and they are a married couple. In correspondence, the appropriate form of address depends upon whether they have the same surname or not. Some examples are:

Two men:

Dear Mr. Smith and Mr. Jones

Dear Messrs. Smith and Jones

Dear Messrs. Johnson

Two women:

Dear Mrs. Smith and Mrs. Jones

Dear Mesdames Smith and Jones

Dear Mesdames Johnson

Answer 2

If Mr. Jones and Mr. Smith marry, they are referred to as Messrs. Jones and Smith, unless Mr. Smith takes Mr. Jones' last name, in which case they are referred to as Messrs. Jones. Mr. Jones is Mr. Smith's husband. And, Mr. Jones' family are now Mr. Smith's in-laws.

Likewise, Mrs. Jones and Mrs. Smith are referred to as Mesdames Jones and Smith, or Mesdames Jones if they both share the same surname. Mrs. Jones is Mrs. Smith's wife. And, Mrs. Jones' family are now Mrs. Smith's in-laws and vice versa.

I would like to add that Mr. Jones is now uncle to Mr. Smith's nephews and nieces. Mrs. Smith is now aunt to Mrs. Jones' nephews and nieces.