From King Dictionary of Contemporary English
Related topics: Family
grandsongrand‧son /ˈɡrænsʌn/ ●●● S3 W3 noun [countable] SSFFAMILYthe son of your son or daughter
Examples from the Corpus
grandsonBut suppose the paternal grandfather were dead when the eldest grandson was born?But it was as if her grandson had saved her life with his gift.His grandson now lives in the house.Willie Greene, his 4-year-old grandson, came to visit the ranch with a pocketful of marbles.Television is different from the toy that Freud's grandson threw out of the pram.Sigistrix was, after all, the grandson of Theodoric.If he proceeds from the Son, why do you not say he is the grandson of the Father?