Why are family reunions and holiday gatherings so often prone to free-floating angst, irrational episodes and inexplicable outbursts? Such eruptions may have origins that are utterly obscure or only dimly remembered, but complexity science can help us make sense of them. In his extraordinary book The Developing Mind, How Relationships and the Brain Interact to Shape Who We Are, psychiatrist and scholar Daniel J. Siegel talks about the family not only as a complex system, but as a supersystem, composed [...]