Genesis 4:18 says, And unto Enoch was born Irad: and Irad begat Mehujael: and Mehujael begat Methusael: and Methusael begat Lamech.  This is simply a list of the descendants of Cain, and there is nothing much to add to it.  The earth was being populated is about all that we might say.  Verse nineteen states, And Lamech took unto him two wives: the name of the one was Adah, and the name of the other Zillah. In  this verse, we see that God's concept of marriage was already being corrupted.  What we must always remember is that marriage is an institution created by God, where a man and a woman become one flesh under the authority of God.  No man made law is ever going to change that, but unfortunately we too often leave God out of marriage.  Verse twenty says, And Adah bare Jabal: he was the father of such as dwell in tents, and of such as have cattle.  This verse tells us of the occupation of the descendants of one of the sons of Adah, Jabal and his descendants.  The raised cattle.  Verse twenty-one adds, And his brother’s name was Jubal: he was the father of all such as handle the harp and organ.   Adah's other son, Jubal, and his descendants were musicians.  Verse twenty-two declares, And Zillah, she also bare Tubalcain, an instructer of every artificer in brass and iron: and the sister of Tubalcain was Naamah.  Zillah, the other wife of Lamech, had a son named Tubalcain,, and he was a metal smith, I guess would be accurate.  Zillah also had a daughter named Naamah, and we are not told what she did.  Verse twenty-three declares, And Lamech said unto his wives, Adah and Zillah, Hear my voice; ye wives of Lamech, hearken unto my speech: for I have slain a man to my wounding, and a young man to my hurt.  Though we are not told who, we are told that Lamech called his wives to him and told them that he had killed a young man.  We are not told why or how he did this, but simply the fact that he did.  He knew that he had done wrong.  I guess confessing to his wives was a good thing, but it did not change the facts.  Confessing our sins, especially to those closest to us may be a good thing, but it does not excuse the sin.  Verse twenty-four adds, If Cain shall be avenged sevenfold, truly Lamech seventy and sevenfold.  Lamech felt that his punishment would be much greater than Cain's was.  No sin is punished any greater for one person than it is for another.  All sin leads to death, to everlasting separation from God, unless we accept forgiveness through Christ.  Verse twenty-five states, And Adam knew his wife again; and she bare a son, and called his name Seth: For God, said she, hath appointed me another seed instead of Abel, whom Cain slew.  I am not sure how much time passed, but at some point Adam and Eve had another son named Seth, whom Eve said was another seed because Abel had been killed.  He was not a replacement for Abel though.  I do not believe that one child can ever replace another, but can only be another blessing themself.  Verse twenty-six declares, And to Seth, to him also there was born a son; and he called his name Enos: then began men to call upon the name of the LORD.  Even though Adam and Eve had walked with God in the garden of Eden, we are told that with the birth of Enos, the son of Seth, people began to call on the name of the LORD, or the only real God.  No matter how close our parents may be or have been to God, we must call on Him individually to be saved.