YOU SAID:
my sister is way better than your sister
INTO JAPANESE
私の妹はあなたの妹よりずっといいです
BACK INTO ENGLISH
My sister is much better than your sister
INTO JAPANESE
私の妹はあなたの妹よりずっといいです
BACK INTO ENGLISH
My sister is much better than your sister
That didn't even make that much sense in English.