No, only if he does not meet all requirements to be your dependent then you can uncheck the box.
Please review the requirements of claiming a dependent:
Qualifying child
- They're under the age of 19 (or 24 for full-time students).
- No age limit for permanently and totally disabled children.
- They lived with you for more than half the year (children living in college count as living with you).
- They didn't provide more than half of their own support for the year.
- They're related to you.
- They aren't claimed as a dependent by someone else.
- They're a U.S. citizen, resident alien, national, or a Canadian or Mexican resident.
- They aren’t filing a joint return with their spouse.
The issue here will most likely be if he provide more than half of his own support for the year. Please see Worksheet for Determining Support to calculate if he provided more than half of his own support. If yes, then he cannot be claimed as a dependent and select this legally on his return.
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