Did Adam have a fourth son?

Answer 1

Yes, according to Genesis 5:4 "And the days of Adam after he had begotten Seth were eight hundred years: and he begat sons and daughters" Adam had at least two sons and two daughters, in eight hundred years though he must have had a lot more than that. Even at the time of Seth's birth Adam and Eve were 130 years old, so it is highly unlikely that Cain and Abel were the only two sons that Adam and Eve had before Seth. When you take into account that when Cain was being exiled for the murder of Abel, he feared retribution (from whom?), then in his exile his wife bears him a son (where did the wife come from?), and builds a city in his son's name (with who's help?) it becomes clear that when God blessed Adam and Eve with "Be fruitful, and multiply" in Genesis 1:28, He really meant it.