YOU SAID:
I love your sisters best friends brother
INTO JAPANESE
私はあなたの姉妹の親友の兄弟を愛しています
BACK INTO ENGLISH
I love your sister's best friend brother
INTO JAPANESE
あなたの妹の親友の兄弟が大好きです
BACK INTO ENGLISH
I love your sister's best friend brother
You love that! Don't you?