Indirect questions have two active verb clauses, the first is organised like a question (verb + subject) and the second is organised like normal sentence (subject +verb) but both can begin with question words.
Do you know the person who I saw in the street?
Can you remember where Liz parked the car?
Where is the friend Rebecca told you about yesterday?
Remember that the second clause has the subject before the verb including when it is after a question word.
Do you know where the post office is?
Do you know where is the post office?
Can you tell me who he is?
Can you tell me who is he?
Could you tell him how old you are?
Could you tell him how old are you?