How did Adam and Eve populate the earth with only two sons?

According to the Bible, Adam lived for 930 years and had many sons and daughters. Because they were genetically pure, incest was not an issue. Genesis 5:1-5 This is the book of the genealogy of Adam. In the day that God created man, He made him in the likeness of God. 2 He created them male and female, and blessed them and called them Mankind in the day they were created. 3 And Adam lived one hundred and thirty years, and begot a son in his own likeness, after his image, and named him Seth. 4 After he begot Seth, the days of Adam were eight hundred years; and he had sons and daughters. 5 So all the days that Adam lived were nine hundred and thirty years; and he died. Original video: https://www.youtube.com/watch?v=fV2JRNKRi4g