Question: What is the word for brother and sister dating?

3 Answers. In English, the preferred term appears to be double in-law marriage. The two couples become double in-laws or simply double couples.

What do you call siblings dating?

The most commonly used word would be incest, although technically, incest refers to sex between (close) relatives. However, since a marriage is usually supposed to be consummated (meaning the partners in the marriage do have sex), the word is also applied to marriage.

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