Wiktionary
grandson-in-law
n. The husband of one's grandson or granddaughter.
Usage examples of "grandson-in-law".
Nor did he say anything of the dreadful turmoil within his own household—of the erratic behavior of his son-in-law, Martha's husband, Thomas Mann Randolph, or of the grandson-in-law, Charles Bankhead, who was subject to violent alcoholic rages.
Nor did he say anything of the dreadful turmoil within his own household--of the erratic behavior of his son-in-law, Martha's husband, Thomas Mann Randolph, or of the grandson-in-law, Charles Bankhead, who was subject to violent alcoholic rages.