Enoch: Oldest Son of Cain
Source: Nav
Genesis 4:17, 18
And Cain had relations with his wife, and she conceived and gave birth to Enoch. Then Cain built a city and named it after his son Enoch. / Now to Enoch was born Irad, and Irad was the father of Mehujael, and Mehujael was the father of Methusael, and Methusael was the father of Lamech.