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Is your brother a beneficiary?
Are there any assets in your parent's name alone?
Why do you not want to provide these documents to your brother?
Before you parents' death, were you appointed under a Power of Attorney to deal with your parents' finances?
I can only answer about the law in Canada.
First, in Canada he has to be provided with a copy of the Will when you apply to probate the Will and you must probate the Will as there are assets in your parent's name alone. As well, the Will becomes a matter of public record as soon as probate is applied for so anyone at all can get a copy of the Will from the courthouse.
Second, he has a right to a full accounting of the estate. He must be told what went into the estate and what has gone out and where it's gone.
As you were acting under a POA you must also make a full accounting of what you did and must provide all records.
So it sounds like what your brother is asking for is what he is entitled to receive. If he takes you to court he will most likely win and will get an order for his costs which may very well end up being ordered against both of you personally rather than against the estate.
If you don't have a lawyer in Canada acting for you it sounds like it is time to retain one as you cannot be expected to know the law and may end up hurting yourselves if you don't have someone advising you.
You are very welcome.