YOU SAID:
my goldfish ate its brother im so sad
INTO JAPANESE
私の金魚を食べたその弟イムとても悲しい
BACK INTO ENGLISH
His brother ate my goldfish IM so sad
INTO JAPANESE
彼の兄弟を食べた私の金魚イムとても悲しい
BACK INTO ENGLISH
His brother ate my goldfish IM so sad
That didn't even make that much sense in English.