As per CRA, If your dependant was 18 or older
To claim for a dependant who was 18 years or older at the end of the year, fill out the chart for line 31800 on the Federal Worksheet for your return at Get a T1 income tax package to calculate your claim for each dependant.
We suggest you to refer this link : How do I claim the Disability Tax Credit transferred from my dependant?
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