Cain knew his wife intimately. She became pregnant and gave birth to Enoch. Cain built a city and named the city after his son Enoch.
References for Genesis 4:17
Irad was born to Enoch. Irad fathered Mehujael, Mehujael fathered Methushael, and Methushael fathered Lamech.
Lamech took two wives, the first named Adah and the second Zillah.
Adah gave birth to Jabal; he was the ancestor of those who live in tents and own livestock.
His brother's name was Jubal; he was the ancestor of those who play stringed and wind instruments.
Zillah also gave birth to Tubal-cain, the ancestor of blacksmiths and all artisans of bronze and iron. Tubal-cain's sister was Naamah.
References for Genesis 4:22
Lamech said to his wives, "Adah and Zillah, listen to my voice; wives of Lamech, pay attention to my words: I killed a man for wounding me, a boy for striking me;
so Cain will be paid back seven times and Lamech seventy-seven times."
Adam knew his wife intimately again, and she gave birth to a son. She named him Seth"because God has given me another child in place of Abel, whom Cain killed."
References for Genesis 4:25
Seth also fathered a son and named him Enosh. At that time, people began to worship in the LORD's name.