Hello, sorry to hear about your loss. Yes, you can still file the return for your son as if they were alive.
If the deceased had not filed individual income tax returns for the years prior to the year of their death, you may have to file.
It's your responsibility to pay any balance due and to submit a claim if there's a refund.
If you want to use TurboTax you will have to use the following link to file prior year returns:
https://turbotax.intuit.com/personal-taxes/past-years-products/
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