I'm not sure why the IRS used the address from his childhood home. They typically send any correspondence to the address used on the latest tax return filed.
If your confirmation letter was forwarded to his mom's new address, the check should also be forwarded.
If you have already filed your tax return, you should make sure your address is updated with the IRS to avoid any issues in the future.
You can go to the following link and update your information with the IRS directly.
Change of address
@Arhylda
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