YOU SAID:

your dad is my mom and my stepsister is your son

INTO JAPANESE

あなたのお父さんは私の母であり、私の義理の妹はあなたの息子です

BACK INTO ENGLISH

Your dad is my mother and my sister-in-law is your son

INTO JAPANESE

あなたのお父さんは私の母であり、私の義理の妹はあなたの息子です

BACK INTO ENGLISH

Your dad is my mother and my sister-in-law is your son