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Thank you for your questions.
I have to ask where and when the Will was probated.
I have to ask the moderators to move your question to the Canada Law experts.
I am sorry to hear this.
If you can prove that your mother-in-law was not mentally competent at the time that she signed her last will then the court would set aside that will and her second last will take its place.
As well, it is possible to successfully contest the will if you can prove that the testator was under undue pressure at the time that she signed her will.
It is possible that in the will she set out provisions allowing the executors of the will to have sole and unfettered discretion in which case they could say that no monies can be taken ahead of time but that would be strange for them to do this if they are looking out both for the testator's wishes and for the best interest of your grandson as they owe him a fiduciary duty.
Even if the Will cannot be set aside because you failed to prove what I discussed above it will still be possible to have the executors removed if they are not adhering to their fiduciary duty. Given that this one executor seems to have profited usually,at the best case sceanario, by acting for your mother-in-law the court would be highly suspect I would think.
Your best next step would be to be to retain an experienced estate litigator in Montreal. There is a significant amount of money at stake and this should not be let go of course.