[s12e19] Split Decisions -

: The mystery culminates in the revelation of a fourth brother. These siblings were the result of an in-vitro fertilization (IVF) treatment 25 years prior. Their mother, Vivian Brentson, had been told the extra embryos were destroyed, but the clinic—where the victim, Dr. Kiel, had once interned—had instead "donated" them to other families. Forensic Innovation: Antibody Profiling

This response uses data provided by Google's Knowledge Graph [S12E19] Split Decisions

The central mystery revolves around the impossible appearance of a single suspect in multiple places at once. : The mystery culminates in the revelation of

: As the investigation deepens, the team discovers Jordan is not alone. They first find an identical twin, Xavier Marx, and then a triplet, Kevin Chance. Kiel, had once interned—had instead "donated" them to

: Video footage and DNA evidence initially point to Jordan Brentson.

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While the brothers share the same genetic code, their unique life experiences, diets, and environments have shaped distinct immune systems.