No, Cain did not marry Seth. Him and Seth were actually brothers.
Chat with our AI personalities
26 verses, Expelled from Eden. Cain, Abel, Abel murdered, Cain's offspring, Seth.
According to the Bible, Adam and Eve had other sons and daughters, including Seth: "And the days of Adam after he had begotten Seth were eight hundred years: and he begat sons and daughters:" - Genesis 5:4
Which Lamech, the descendent of Cain or the descendant of Seth? If it's the latter, the Bible puts his birth at about 874 years after the expulsion from Eden.
cain
The bible does not say that Cain was black.