The Qualifying Child rules for a dependent. you seem to meet them. The only question is if he earned enough to qualify to having provided more than half his own support.
Relationship YES he is your son and I assume he is a US citizen.
Age At the end of the filing year, your child was younger than you (or your spouse if you file a joint return) and younger than 19
SupportYour child may have a job, but that job cannot provide more than half of her support. Te see if he may have fill out this https://apps.irs.gov/app/vita/content/globalmedia/teacher/worksheet_for_determining_support_4012.pdf
Residency Child must live with you (or your spouse if you file a joint return) in the United States4 for more than half of the year. You said he lived with you more than 6 months.
Joint Return
- The child cannot file a joint return for the tax year unless the child and the child's spouse did not have a separate filing requirement and filed the joint return only to claim a refund
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