YOU SAID:

Ask my brother what’s his favorite colour.

INTO JAPANESE

私の兄弟に彼の好きな色が何かを尋ねます

BACK INTO ENGLISH

I ask my brother what his favorite color is

INTO JAPANESE

私は彼の好きな色が何であるか兄に頼みます

BACK INTO ENGLISH

I ask my older brother what his favorite color is

INTO JAPANESE

私は兄に彼の好きな色が何であるか尋ねます

BACK INTO ENGLISH

Like his brother, I ask what is color?

INTO JAPANESE

それは？

BACK INTO ENGLISH

And that was.

INTO JAPANESE

最後かもしれん

BACK INTO ENGLISH

And that was.