And Abimelech called Isaac, and said, Behold, of a surety she is thy wife: and how saidst thou, She is my sister? And Isaac said unto him, Because I said, Lest I die for her.
 

26:9 she is thy wife. The Nuzi tablets, from northern Mesopotamia and describing life and customs in the patriarchal age, indicate that it was possible for a man to adopt a woman as his sister, then later also take her as his wife. It is thus at least possible that Rebecca was both wife and sister to Isaac–the same for Abraham and Sarah.

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