YOU SAID:
Hey what are you doing step-bro
INTO JAPANESE
おい、義理の兄弟、何してるんだ?
BACK INTO ENGLISH
Hey, brother-in-law, what are you doing?
INTO JAPANESE
おい義弟何してるんだ?
BACK INTO ENGLISH
Hey, brother-in-law, what are you doing?
That didn't even make that much sense in English.