YOU SAID:

I'm not going to your sister's house.

INTO JAPANESE

お姉さんの家には行かないよ。

BACK INTO ENGLISH

I'm not going to my sister's house.

INTO JAPANESE

妹の家には行きません。

BACK INTO ENGLISH

I won't go to my sister's house.

INTO JAPANESE

妹の家には行きません。

BACK INTO ENGLISH

I won't go to my sister's house.