Hi @Optimistic_g. I would recommend contacting the IRS directly to see if you can respond now to prove that your nephew resides with you so that you can claim him as a qualifying dependent. I would also suggest verifying that you will not have any issues claiming him as a dependent for the tax returns you need to complete.
If the IRS says that you cannot claim him as a dependent, I would then file an amendment for the tax year's applicable.
Here is the link to contact the IRS. Please note that it might be very busy right now due to the tax extension deadline for 2021 returns approaching on 10/17/22. I do advise calling first thing in the morning when they open at 7AM.
https://www.irs.gov/help/telephone-assistance
(Scroll down to "IRS Phone Numbers and Tax Help Options")
Enjoy your day!
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