The Koran always calls Jesus the son of Mary. That means he is the child of his mother, just like any other human being.
2:87 We gave Moses the book, and after him, We sent the messengers. Later We gave Jesus son of Mary the clear proofs, and We supported Him with the Holy Spirit. Is it that every time a messenger comes to you with what your minds do not desire, you become arrogant? A group of them you deny, and a group of them you fight/kill!
43:57 And when the son of Mary was put forth as an example, your people turned away from it.
5:110 God said: "O Jesus, son of Mary, recall My blessings upon you and your mother, that I supported you with the Holy Spirit; you spoke to the people in the cradle and middle-age; and I taught you the Book and the wisdom, and the Torah, and the Gospel; and you would create from clay the shape of a bird, then blow into it and it becomes a bird with My permission; and you would heal the blind and the leaper with My permission; and you would bring out the dead with My permission. And I have restrained the Children of Israel from you, that you came to them with proofs; but those who rejected among them said: 'This is clearly magic!'"
3:45 The controllers said, "O Mary, God gives good news of a word from Him. His name is the Messiah, Jesus the son of Mary. Honorable in this world and in the Hereafter, and from among those who are made close."