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As your father is not your dependant, you may not be able to claim as one of the requirements to claim is that the dependent has to be living with the taxpayer. Therefore, if they are not listed as your dependent, you will not be able to claim medical expenses for them.
For more information please visit the TurboTax link: https://turbotax.intuit.ca/tips/medical-expense-tax-credit-for-other-dependants-5311