YOU SAID:
i thought i had bought the best borough for my brother
INTO JAPANESE
私は兄のために最高の自治区を買ったと思った
BACK INTO ENGLISH
I thought I bought the best autonomous region for my brother
INTO JAPANESE
兄のために最高の自治区を購入したと思いました
BACK INTO ENGLISH
I thought I bought the best autonomous region for my brother
That didn't even make that much sense in English.