YOU SAID:
Your mom is the nicest person on earth
INTO JAPANESE
あなたのお母さんは地球上で一番いい人です
BACK INTO ENGLISH
Your mom is the best person on the planet
INTO JAPANESE
あなたのお母さんは地球上で最高の人です
BACK INTO ENGLISH
Your mom is the best person on the planet
That didn't even make that much sense in English.