The thing to understand about the form IMM 5476 is that as a individual or firm you are representing this application that includes (Sponsor, Co-signer ,and sponsored person).So if i don't fill it out, they will send all the correspondance to my home country where my parents live ?
They have all the details about every person that they have gathered from the forms.
If they require any additional information about any person in this application , it will go to the concerned person either by email or mail, if you don not use this form.
Hope it helps