Joktan
In the Book of Genesis 10:25 it reads: "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 . " 
<triplet> Peleg <subj> Joktan <obj> sibling <triplet> Joktan <subj> Peleg <obj> sibling