YOU SAID:

extremely unpleasant sister's farts on my uncle

INTO JAPANESE

私の叔父に対する非常に不快な妹のオナラ

BACK INTO ENGLISH

very obnoxious sister farts on my uncle

INTO JAPANESE

私の叔父に非常に不快な妹のおなら

BACK INTO ENGLISH

sister farting very offensive to my uncle

INTO JAPANESE

私の叔父に非常に不快な妹のおなら

BACK INTO ENGLISH

sister farting very offensive to my uncle