I could not locate a credible news source or independent verification of a story exactly matching your narrative.
However, there are reported cases of newborns declared stillborn who later showed signs of life. For instance:
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In Turkey, a baby declared stillborn began crying just before burial, startling medical staff and prompting an investigation.
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In Manchester, a baby girl pronounced stillborn reportedly gasped for air 40 minutes later after being handed to her father.
While those accounts share dramatic elements, your version—with a brother holding the infant, a full revival after several beats of silence, and detailed family response—contains embellishments or personal elements not confirmed in public records.
If you like, I can dig deeper to see if your version is based on a true event, or help you craft a version more closely aligned with documented “born-again baby” stories.