He is the twin brother of Dr. Dennys Murry, a neurosurgeon specializing in research; elder brother to Charles Wallace Murry, who does not appear in the novel (or in any of the O'Keefe books); and a younger brother to Polly's mother, Meg Murry O'Keefe.
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Of the three major crossover characters between the O'Keefe family and Austin family series of books (the others being Canon Tallis and Adam Eddington), Zach is the only one who first appeared in the Austin books.
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