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No. They do not have any rights whatsoever.The only time they could again any rights would be to go to court and get a court order. Perhaps the registered letter actually threatened court and that is fine. It could be an empty threat. And even if they did proceed to court while they may be able to obtain the right to have access to your mother it would certainly not be for one day and would certainly not be that she would have to be alone with them during the meeting if she has dementia.It is not clear whether your father actually has the right to decide for your mother. That would depend on whether she appointed him under a power of attorney before she became mentally incompetent. If she did not then for your father to have the right to make decisions about her care or finances he would have to apply to the court for an order appointing him as her legal guardian.
The court may grant him the right to have a visit from time to time but it would not be at all what he wants. It would not be all day and it would not be by himself with your mother.
He has no right at all to know anything about her medical situation. That is all confidential information.
Your father may not be able to block occasional visits in if he is acting with authority. The court may still grant your uncle visits with his sister.
No this is not federal law it is provincial law but all the provinces have similar laws with respect to this issue.
If your mother is competent then she makes decisions about all of this. It is only if she's not competent that the court would be involved or your father would have any say. The court may let her have access with her brother with a third-party present.