As we mentioned above, all men and women are the offspring of Adam and Eve, and nothing else has interfered or affected the creation of men and women. If so; there is the question of the marriage of Adam's children. When it is unlawful for sister to marry her brother, what has happened then? And who has been the children's mates? There are two answers to be considered here:

      1) In emergency cases, unlawfuls can temporally be considered lawful such as the flesh of swine which is declared unlawful, but if one's life is endangered by starvation and want of food, he may serve to save.

      So was the emergency case with Adam's children, and they could marry each other for their especial case.

      2) According to some Islamic traditions, ADAM, has not been the frist man that has appeared upon the earth. Scientific researches show that man has been living on the globe for several millions of years, while the history of Adam and Eve goes back to a few thousands! Therefore we have to admit that before Adam and Eve there must have been mankind and other human generation living here, and Adam's children could have been married with these pre-human beings. In other word, Adam was not the first human being that was created on the earth. He rather was the first God's elect and apostle, chosen from among those semi-wild human generation that the earth was inhabited by them. And therefore Adam must have been the first civilized, godly man, inspired and given social and religious law and regulations.