YOU SAID:
I love my best friends brother
INTO JAPANESE
私は私の親友の兄弟を愛しています
BACK INTO ENGLISH
I love my best friend's brother
INTO JAPANESE
私の親友の弟
BACK INTO ENGLISH
My best friend's brother.
INTO JAPANESE
私の親友の弟
BACK INTO ENGLISH
My best friend's brother.
You've done this before, haven't you.