Cain was the firstborn son of Son of::Adam and Son of::Eve. The first human born on the earth, and also the first human to kill another, the first murderer. Cain was born, and murdered his brother Sibling of::Abel within the first 130 years of the earth's existence.
Lamech was the one of whom we read, in Genesis 4:19-24, Lamech married two women, one named Adah and the other Zillah. Adah gave birth to Jabal; he was the father of those who live in tents and raise livestock. His brother's name was Jubal; he was the father of all who play the harp and flute. Zillah also had a son, Tubal-Cain, who forged all kinds of tools out of bronze and iron. Tubal-Cain's sister was Naamah. Lamech said to his wives, "Adah and Zillah, listen to me; wives of Lamech, hear my words. I have killed a man for wounding me, a young man for injuring me. If Cain is avenged seven times, then Lamech seventy-seven times."