お子(こ)さん

おこさん
noun
(someone else's) child
politefamilyperson
1. (someone else's) child
Polite term used to refer to another person's child or children. This is the respectful form used when speaking about or to someone else's children.
お子(こ)さんは何歳(なんさい)ですか。
How old is your child?
Polite way to ask about someone's child
お子(こ)さんは元気(げんき)ですか。
How is your child (doing)?
お子(こ)さんがいらっしゃいますか。
Do you have children?
Very polite form using いらっしゃる
What is your child studying at school?
Children grow up so fast. Your child has gotten much bigger since the last time I saw them.

お子(こ)さん is the polite form used when referring to someone else's child. For your own children, use 子供(こども) or うちの子(こ).

Related words

The お〜さん pattern is common for polite reference to people: お客(きゃく)さん (customer), お医者(いしゃ)さん (doctor).

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Referring to People: Pronouns, Names, Titles, and Family Terms