YOU SAID:

I hate my sister and her cat

INTO JAPANESE

私は妹と彼女の猫が嫌いです

BACK INTO ENGLISH

I hate my sister and her.

INTO JAPANESE

私は妹と彼女が嫌いです。

BACK INTO ENGLISH

I don't like my sister and her.

INTO JAPANESE

私は妹と彼女が好きではありません。

BACK INTO ENGLISH

I don't like my sister and her.