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You telling you parents to file early doesn't make it any more possible, if they are waiting for necessary tax forms. If they own a business or rental property, and claim depreciation, they CAN'T file their taxes yet.
If you parents use an accountant or a CPA, they might not be high on that person's list of priorities - particularly of those higher on the list of priorities are those that send 1099's and other tax forms to people like your parents