The IRS defines a disabled person for the purposes of claiming dependents as:
A person is permanently and totally disabled if both of the following apply. He or she can't engage in any substantial gainful activity because of a physical or mental condition. A physician determines that the disability has lasted or can be expected to last continuously for at least a year or can lead to death.
You should consult a physician to determine his condition according to the above criteria.
You should also determine if he can be claimed as a qualifying child or as a qualifying relative.
Please read this TurboTax Help article for more information.
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