In order to claim him as a dependent he would need to live with you for the entire year. He will need an ITIN or SSN to be claimed for the $500 Non Refundable Other Dependent Credit.
However, if you get married this year, he would not be considered a dependent at all. Your filing status would be Married Filing Jointly or Married filing separately. He will need a SSN or ITIN to file. It will be easiest to file if he gets a SSN before next years time to file if you are married.
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