A Prophet Says that Allah Has Grandfather

The most ridiculous suspicion is: I heard one of them saying: There is a verse in Quran saying that Allah has a grandfather, so who is His grandfather….?!

And h mentions Allah the Almighty saying in Quran: "And [it teaches] that exalted is the nobleness of our Lord; He has not taken a wife or a son (3) And that our foolish one has been saying about Allah an excessive transgression. (4)" Al Jin 3-4