I'm pretty confident that I have bank accounts/stocks/bonds which my estranged father set up when I was a child although I don't know at what banks. He has an account at almost every major bank in canada. Since he keeps the finances in our family very secret and refuses to give me any helpful information about how I can access the money, I need to know whether I can find out how much money is in my name.

I think you posted this question before, Looks like he doesn't want you to know anything about his finances
So why are you so sure some is in your name? And it seems to me if it was he would want you to know right? Something does not sound right here. You are wanting to access money you may or may not have.

If the accounts are in your name, you'll get interest statements. If you are estranged I very much doubt that your father is paying taxes on YOUR interest.