YOU SAID:
I'like my sister's shape
INTO JAPANESE
私は妹の形が好きです
BACK INTO ENGLISH
I like my sister's shape
INTO JAPANESE
姉の形が好き
BACK INTO ENGLISH
I like the shape of my sister
INTO JAPANESE
妹の形が好きです
BACK INTO ENGLISH
I like the shape of my sister
That didn't even make that much sense in English.