息子むすこさんMeanings1nounson (honorific)honorific or respectful (sonkeigo)Polite way to refer to someone else's son. Not used for one's own son; for that, use 息子 (むすこ) without さん.息子むすこさんはおいくつですか。How old is your son?隣となりの息子むすこさんが大だい学がくに合ごう格かくしたそうです。I heard that the neighbor's son passed the university entrance exam.
