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“Honest and vulnerable and caring.”—The Washington Post
“Addictively readable.”—Entertainment Weekly
“The science of siblings is well overdue for this kind of attention.”—The Boston Globe
“A page turner . . . a worthwhile read for anyone interested in human relationships.”—Associated Press
“Endlessly fascinating.”—Parent Magazine
Jeffrey Kluger is a senior editor and writer at Time magazine. He is a coauthor of the bestseller Apollo 13 and the author of Simplexity, Splendid Solution, Moon Hunters, and two novels for young adults. He lives in New York City with his wife and daughters.