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A panic-stricken Dr. Weaver faces a life-defining moment when she is ordered to give up her son to the Lopez family while Dr. Carter greets a returning Kem -- but their meeting with his father is tense after Carter announces plans for his grandmother's estate. Elsewhere, Abby is in the midst of her psychiatric rotation and tries to help a seizure-prone mother with a controversial drug treatment. Meanwhile, Neela impresses everyone with her lab research, especially when she helps one of the reckless students after he experiments on himself. In addition, Dr. Kovac's relationship with Sam and her son Alex grows awkward when Alex' father returns.