YOU SAID:

I wonder if my brother will ever come back.

INTO JAPANESE

弟は戻ってくるのだろうか。

BACK INTO ENGLISH

Will my brother come back?

INTO JAPANESE

お兄ちゃんは帰ってくるの？

BACK INTO ENGLISH

Is your brother coming home?

INTO JAPANESE

お兄さんは帰ってくるの？

BACK INTO ENGLISH

Is your brother coming home?