﴿ وَوَهَبْنَا لَهُۥٓ إِسْحَٰقَ وَيَعْقُوبَ نَافِلَةًۭ ۖ وَكُلًّۭا جَعَلْنَا صَٰلِحِينَ ﴾

“And We bestowed upon him Isaac and [Isaacs son] Jacob as an additional gift and caused all of them to be righteous men,”

And We gave him namely Abraham — for he had asked for a child as mentioned in sūrat al-Sāffāt Q. 37100 — Isaac and Jacob as a gift that is as something in addition to what was requested; or it means ‘a grandson’; and each of them that is himself and the two born of him We made righteous We made them prophets.