YOU SAID:
Isabella is my best friend and sister.
INTO JAPANESE
イザベラは私の親友であり姉妹です。
BACK INTO ENGLISH
Isabella is my best friend and sister.
INTO JAPANESE
イザベラは私の親友であり姉妹です。
BACK INTO ENGLISH
Isabella is my best friend and sister.
That didn't even make that much sense in English.