I am sorry for the passing of your son.
You may file your son's final tax return, but you are not responsible for your son's tax debt.
See below for guidance.
http://moneyning.com/money-management/heirs-responsibilities-after-a-death/
http://finance.zacks.com/happens-federal-income-tax-debt-person-owes-dies-6209.html
https://turbotax.intuit.com/tax-tools/tax-tips/Family/Death-in-the-Family/INF12090.html
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