Fetching details from the dictionary...
younger sister
妹いもうとは絵えを描くえがくのが上手じょうずだ。
My younger sister is good at drawing.
妹いもうとと買い物かいものに出かけでかけた。
I went shopping with my younger sister.
妹いもうとが大学だいがくに受かっうかったと聞いきいてとてもうれしかった。
I was very happy to hear my sister got into college.