Genesis 10:25

And unto Eber were born two sons: the name of one was Peleg; for in his days was the earth divided; and his brother's name was Joktan.

1. Eber, a great grandson of Shem, had two sons: Peleg and Joktan.
2. The earth was divided during Peleg's lifetime.
3. The earth being divided may refer to the process by which the oceans and continents changed from what is described in Genesis 1:9 to what exists today. It could also refer to the division of the earth into countries and nations. There doesn't appear to be much additional information on the subject in the bible.