In TurboTax the questions that are asked in the "My Info" section are designed to determine if you/he meets one of the dependent tests (qualifying child or relative).
Your question may come down to, did you provide more than 1/2 of his total support.
According to Publication 501:
Person's own funds not used for support.
A person's own funds aren't support unless they are actually spent for support.
So only the portion of his SSDI that is actually used for his support (see below) counts as his contribution.
Further, according to Publication 501:
Total support includes amounts spent to provide food, lodging, clothing, education, medical and dental care, recreation, transportation, and similar necessities.
Only the taxable portion of social security benefit payments count toward the gross income test. If that is his only income then likely none of it is taxable and therefore does not count toward the $4700 limit. A rule of thumb is take 1/2 of his social security benefit and add all other income and if the total exceeds $25,000, then some will be taxable.
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