YOU SAID:

my brother went out with my step-dad last night and came back with mcdonalds

INTO JAPANESE

私の兄は昨夜私の義父と一緒に出かけ、マクドナルドと一緒に戻ってきました

BACK INTO ENGLISH

My brother went out with my father-in-law last night and came back with McDonald's

INTO JAPANESE

兄は昨夜義父と一緒に出かけ、マクドナルドと一緒に戻ってきました

BACK INTO ENGLISH

My brother went out with my father-in-law last night and came back with McDonald's