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Can you find your father to be sure that he is living?
I have not interest to look for my father, I'm 90% sure that is still alive. I do not know the exact place where he lives but if I wanted I can find him.
Then that is going to be a problem. You cannot sponsor your brother because from a legal point of view you can sponsor your father.
You could try and get special permission from Canada Immigration if you could show that who he is or where he is is unknown to you. If you can say he has not been part of your life since you were an infant and have no idea where he is or even if he is living that may work.
It is a difficult and very unfair situation and so I would hope the goverment would consider your situation with compassion but that is not often the case.
You would do best by retaining an immigration lawyer in your city to act for you for this issue.