@stpmsnwm377 Thanks for the question!!
If you are eligible to claim your stepson as a dependent on your return, then you will have to amend your 2023 return to do so. First, your stepson will need to amend & file his return & check the box that " he can be claimed as dependent on someone else's return".
If you try to e-file your amended return, it may cause a rejection because of stepson's SSN already used to file a return. Once your stepson files his amended return, it takes time to be processed by the IRS & their system to be updated. So, paper filing your amended return would be the only option for you now, unless you wait for his amended return to be fully processed by IRS.
Amended returns take at least 12-16 weeks to be processed. https://www.irs.gov/filing/wheres-my-amended-return
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