There are only two families in the ages before the flood, the sons
Of God and the daughters of men (Genesis 6:1-8). The descendants of Seth were the sons of God (Genesis 4:25; Genesis 5:3-32). There was only one other family (Genesis 4:9-23). Therefore, the daughters of men were descendants of Cain.
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Bibliography Information Johnson, Ashley S. "Entry for 'Daughters of Men'". "Condensed Biblical Cyclopedia". <http://www.searchgodsword.org/enc/cbc/view.cgi?number=T9>. 1896.