As per the Canada Revenue Agency: In addition to receipts, we may ask to see proof of payment, such as bank or credit card statements.
In light of this, each you and your son need to claim the expense you each paid for, should the Canada Revenue Agency ask for proof in the future.
As per claiming medical expenses for a dependant over 18, please see our TurboTax FAQ: Medical Expense Tax Credit for Other Dependants
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