If Allāh had intended to take a son, He could have chosen from what He creates whatever He willed. Exalted is He; He is Allāh, the One, the Prevailing.1
لَّٱصۡطَفَىٰsurely, He (could) have chosenla-iṣ'ṭafā
مِمَّاfrom whatmimmā
يَخۡلُقُHe createsyakhluqu
مَاwhatevermā
يَشَآءُۚHe willedyashāu
سُبۡحَٰنَهُۥۖGlory be to Himsub'ḥānahu
هُوَHehuwa
ٱللَّهُ(is) Allahl-lahu
ٱلۡوَٰحِدُthe Onel-wāḥidu
ٱلۡقَهَّارُthe Irresistiblel-qahāru
Tafsir
If Allah wanted to take a son, as the idolaters claim, and Allah is far above from what they say - He would have chosen whom He wants from His creation and taken him as a child. Pure and exalted is He from what these idolaters say. He is One in His essence, attributes and actions, having no partner in them, Subduer of all His creation.