YOU SAID:

my brother is so annoying that he changes for people

INTO JAPANESE

私の兄はとても迷惑なので、人のために変わる

BACK INTO ENGLISH

My brother is so annoying that it changes for people.

INTO JAPANESE

私の兄はとても迷惑なので、人のために変わります。

BACK INTO ENGLISH

My brother is so annoying that it changes for people.