You will have to fill in "Family Information" sheet, where in you include your family member;s details and where they stay.
Conversely, your brother will have submitted your details. This easily shows your ties in Canada.
They will know every details. If you try to hide and they find out, under the accusation of misrepresentation, you may get blacklisted.
About the impact of having siblings in Canada in study permit approval, I am anxious to know too. I have a similar condition. My brother has however applied already and I am waiting to see what will be the outcome.