Adam and Eve according to Scripture had 3 sons- Cain, Abel and Seth.
This is according to Genesis 4:1-2, and Genesis 4:24.
But Adam also had other sons and daughters according to Genesis 5:4
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Genesis 5:1-4
This is the book of the generations of Adam. In the day that God created man, in the likeness of God made he him;
2 Male and female created he them; and blessed them, and called their name Adam, in the day when they were created.
3 And Adam lived an hundred and thirty years, and begat a son in his own likeness, and after his image; and called his name Seth:
4 And the days of Adam after he had begotten Seth were eight hundred years: and he begat sons and daughters:
5 And all the days that Adam lived were nine hundred and thirty years: and he died.