YOU SAID:
I have a sister who hate me and my brother cat.
INTO JAPANESE
私には私と弟の猫を嫌う姉妹がいます。
BACK INTO ENGLISH
I have a sister who hates me and my brother's cat.
INTO JAPANESE
私には私と兄の猫を嫌う姉妹がいます。
BACK INTO ENGLISH
I have a sister who hates me and my brother's cat.
That didn't even make that much sense in English.