妹さん

妹さんは元気？

How's your sister?

妹さんによろしくね。

Say hello to your sister for me.

君(きみ)の妹さんは何年生なの？

What grade is your sister in?

彼(かれ)の妹さんはどうなったのかしら。

I wonder what has become of his sister.

今度は妹さんを連れていらっしゃい。

Bring your sister next time.