What is the minimal evidentiary threshold for determining whether a testator has a valid testamentary capacity?

Ontario, Canada


The following excerpt is from Naismith v. Clarke, 2019 ONSC 5280 (CanLII):

In Campbell v. Campbell, the minimal evidentiary threshold was likewise established. The case involved allegations the testator lacked testamentary capacity, she did not have knowledge nor approve the contents of the Will and undue influence. The matter was a contest between two adult children of the deceased that included disputes about and the extent of payments over time and the purchase of real estate by one adult child from funds from the deceased prior to the deceased’s death. There is also evidence suggesting the testator had issues with her memory. One of the adult children had assumed a caregiver roll in relation to the testator.

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