Were Isaac and Ishmael both sons of Abraham (as)?

Yes. Ishmael (as) and Isaac (as) were both sons of Abraham (as), and the Holy Qur’an often names them together as God's gift to him.

Yes, both were sons of Abraham (as). On this the Holy Qur’an and the Bible agree. Abraham (as) is therefore often called the father of many nations, because great lines of descendants came from both sons.

The Holy Qur’an speaks of both with great warmth. In the first verse above, Abraham (as) thanks God for having given him Ishmael and Isaac despite his old age. He sees both as an answer to his prayer. Neither is placed above the other.

In the chapter from which the third verse comes, the Holy Qur’an first tells of a forbearing son whom Abraham (as) was ready to give up in sacrifice. Only after that come the glad tidings of Isaac (as). This makes clear that Abraham (as) had two sons and that Ishmael (as) was the elder.

The following generations kept this bond as well. In the second verse above, Jacob (as), the son of Isaac, asks his sons on his deathbed whom they will worship after him. They answer that they will worship the God of their fathers Abraham, Ishmael and Isaac. For them Ishmael (as) naturally belongs to the family.

For Muslims this is more than a question of descent. From the line of Isaac (as) came many prophets of the Children of Israel, and from the line of Ishmael (as) came the Holy Prophet Muhammad (saw). Both lines go back to the same father and the same faith in the One God.