I am wondering mostly because I believe its a "cost sharing agreement" and am not sure if I can claim the rent if they aren't claiming it as income.
Claiming the expense on your business requires availability of receipts from your parents.
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Would them producing a receipt change it from being a cost sharing agreement in any way?
As per claiming a business expense while in a cost sharing agreement, you should contact the Canada Revenue Agency to clarify this at 1-800-959-8281.