YOU SAID:

sometimes loek wonders whether his brother is actually his brother, or is adopted

INTO JAPANESE

ルックは時々、自分の弟が本当に自分の弟なのか、それとも養子なのか疑問に思うことがある

BACK INTO ENGLISH

Luc sometimes wonders if his little brother is really his little brother or if he's adopted.

INTO JAPANESE

リュックは時々、自分の弟が本当に弟なのか、それとも養子なのかと疑問に思うことがあります。

BACK INTO ENGLISH

Luc sometimes wonders if his younger brother is really his younger brother or if he is adopted.

INTO JAPANESE

リュックは、自分の弟が本当に弟なのか、それとも養子なのかと時々疑問に思う。

BACK INTO ENGLISH

Luc sometimes wonders if his younger brother is really his younger brother or if he is adopted.