Genesis 4:2 Again she gave birth, to Cain's brother Abel. Abel was a keeper of sheep, but Cain was a tiller of the ground. (WEB)
Genesis 4:22 Zillah also gave birth to Tubal Cain, the forger of every cutting instrument of brass and iron. Tubal Cain's sister was Naamah. (WEB NIV)
Genesis 4:24 If seven lives are to be taken as punishment for Cain's death, seventy-seven will be taken for Lamech's. (BBE)