A: Genesis informs us that after the birth of Seth (their third son following Cain and Abel) Adam and Eve "begot [other] sons and daughters" (Gen. 5:4). The exact number is not mentioned, but you can imagine in 930 years (the life-span of Adam), there must have been quite a few. These children intermarried and during their long life spans mentioned in the rest of Genesis 5, they also had a multitude of children. Everyone that Cain had contact with would have been a descendant of his parents. Whether he married a sister (keep in mind, the biblical command against marrying close relatives was not given until thousands of years later during the time of Moses) or someone more distantly related, Cain's wife must have been a relative. Since the genetic make-up of the first human beings would have been more tolerant of near-relatives mating, this would not have created the problems that it would today.

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