Translation of "Sis" in Japanese

Your big sis will show you.

お姉さんが教えてア・ゲ・ル。

Hey sis, can you turn on the light?

姉ちゃん、明かりをつけてくれる？

"Where's your mom, Tom?" "She's out shopping with my sis."

「トム、お母さんは？」「姉ちゃんと買い物に行ってるよ」