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This is troubling both because it is frightful that this is taking 5 years to resolve and in fact it is still not resolved and that your grandfather did this to you with the parcel of land. It is fraud in my view.
Anyone can speak to the CRA with your grandfather's consent so what you are being told is not true. And your grandfather can also tell the CRA that they can speak to the estate's accountant.
If this cannot be resolved soon then it may be that you will need to consider retaining your own lawyer to help protect your interests.