Hi Torontob, the email you've received from CIC seemed quite clear to me. Let me try to help you to figure this out:
Yes, according to the guide, you can put your address there, but then you'll need to fill the IMM5476, which is what they are requesting now. The following is what is written in the guide: "If you wish to have a representative who can conduct business on your behalf, you must provide their address in this section and on the Use of a Representative (IMM 5476) form."
They didn't say the application will be sent back. They said the Ministerial Instructions say they have to return applications reviewed as incomplete, as yours. But, you'll have 30 days to fix that and avoid having your application being sent back. So, don't wait and send the IMM5476 right away.
It's neither from you nor from your wife they require the IMM5476. It's from the principal applicant, which I guess is either your father or mother. And you are the representative. That's because in IMM0008 you indicated your address to receive communication from CIC on behalf of your parents.
They didn't say you used and immigration consultant. They said "your application appears to be making use of an immigration consultant or lawyer". And it really appears, as it wasn't your parents who filled IMM0008, but you, who acted as an uncompensated (unpaid) immigration consultant to your parents.