Unfortunately, until your mother applies to have a Disability tax credit (DTC) on file with the Canada Revenue Agency, you will not be able to claim it on your taxes. Once your mother has a DTC you can have both your taxes adjusted to claim for past years up to 10 years if the claim is accepted.
You may wish to see our TurboTax FAQ: What's attendant care and what can I claim in TurboTax?
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