YOU SAID:

I have a girlfriend whos parents I hate

INTO JAPANESE

私には嫌いな両親のガールフレンドがいる

BACK INTO ENGLISH

I have a girlfriend of my parents who I don't like.

INTO JAPANESE

私には嫌いな両親のガールフレンドがいます。

BACK INTO ENGLISH

I have a girlfriend of parents I don't like.

INTO JAPANESE

私には嫌いな両親のガールフレンドがいます。

BACK INTO ENGLISH

I have a girlfriend of parents I don't like.