Declan

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The Japanese word

お子さん

is pronounced
okosan | おこさん
means
child (polite)
Examples:
お子さんはおいくつですか?
okosan wa o ikutsu desu ka?
How old are your children? | How old is your child?
君のお子さんは男の子ですか、女の子ですか?
kimi no okosan wa otokonoko desu ka, onnanoko desu ka?
Is your child a boy or a girl?
あなたの留守中は、私がお子さんの世話をします。
anata no rusu chū wa, watashi ga okosan no sewa o shi masu.
I'll look after your child while you are away.
お子さんが車をおりたらすぐに車を出してください。
okosan ga kuruma o ori tara sugu ni kuruma o dashi te kudasai.
Please drive off as soon as your child has left the car.
Examples sourced from tatoeba.org