YOU SAID:

my dad is mean to me and my sister

INTO JAPANESE

私の父は私に意味と私の妹

BACK INTO ENGLISH

My father means me and my sister

INTO JAPANESE

私の父は、私と私の妹

BACK INTO ENGLISH

My father and my sister.

INTO JAPANESE

私の父と私の妹。

BACK INTO ENGLISH

My father and my sister.