YOU SAID:
who do you think the tallest parent in my family is?
INTO JAPANESE
あなたは彼が誰だと思いますか。
BACK INTO ENGLISH
Who do you think he is?
INTO JAPANESE
あなたは彼が誰だと思いますか。
BACK INTO ENGLISH
Who do you think he is?
That didn't even make that much sense in English.