Do you know who is my father or do you know who my father is? Our teacher said the first is right, because the order of the object clause is declarative, that is, subject and predicate In this sentence: who is the subject and is the predicate, so the first sentence is right, but what I said in today's TV play is the second sentence, which puzzles me,

Do you know who is my father or do you know who my father is? Our teacher said the first is right, because the order of the object clause is declarative, that is, subject and predicate In this sentence: who is the subject and is the predicate, so the first sentence is right, but what I said in today's TV play is the second sentence, which puzzles me,

According to the normal grammar, it should be the second, because here who my father is appears as a clause, and it is in the interrogative sentence
But I don't pay much attention to what I usually say. The first one is OK

Do you know the boy (who) father is a policeman

whose
Please click "satisfied" in the top right corner of the client,

do you know ()?his father is a doctor.what is his father;what his father is.
Which one should I choose?

what his father is
Object clause declarative sentence word order