He is an ancestor of Abraham.
From Eber, two sons were born, and they were divided.
Gen 10:25To Eber were born two sons; the name of the one was Peleg, for in his days the earth was divided; and his brother's name was Joktan.
1 Chr 1:19To Eber were born two sons: the name of the one was Peleg, for in his days the earth was divided; and his brother's name was Joktan.
Gen 11:16When Eber had lived thirty-four years, he fathered Peleg;Gen 11:17and Eber lived after he fathered Peleg 430 years and had other sons and daughters.Gen 11:18When Peleg had lived thirty years, he fathered Reu;Gen 11:19and Peleg lived after he fathered Reu 209 years and had other sons and daughters.
1 Chr 1:24Shem, Arpachshad, Shelah,1 Chr 1:25Eber, Peleg, Reu,1 Chr 1:26Serug, Nahor, Terah,1 Chr 1:27Abram, that is, Abraham.
{{:Genealogy of Shem}}