Law araadal laahu aiyattakhiza waladal lastafaa mimmaa yakhluqu maa yashaaa'; Subhaanahoo Huwal laahul Waahidul Qahhaar
If Allah had intended to take a son, He could have chosen from what He creates whatever He willed. Exalted is He; He is Allah, the One, the Prevailing.
1 Mufti Taqi Usmani
Had Allah opted to have a son of His own, He would have definitely chosen anyone, as He wished, out of what He had created. (But), Pure is He. He is Allah, the Only One, the All-Dominant.