YOU SAID:
I am attending the wedding of my sister-in-law the day after tomorrow
INTO JAPANESE
明後日、義理の妹の結婚式に出席します
BACK INTO ENGLISH
The day after tomorrow, I will attend the wedding of my sister-in-law
INTO JAPANESE
明後日、義理の妹の結婚式に出席します
BACK INTO ENGLISH
The day after tomorrow, I will attend the wedding of my sister-in-law
That didn't even make that much sense in English.