YOU SAID:
What are you doing tonight? I´m going to my granny house!
INTO JAPANESE
今夜何してるの?私は私のおばあちゃんの家に行きます!
BACK INTO ENGLISH
What are you doing tonight? I will go to my grandma's house!
INTO JAPANESE
今夜何してるの?私は私のおばあちゃんの家に行きます!
BACK INTO ENGLISH
What are you doing tonight? I will go to my grandma's house!
That didn't even make that much sense in English.