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There is new evidence that family arguing leaves a long-lasting imprint on children, diminishing their future happiness and ability to prosper in the world - even when the anger is verbal, not physical. The evidence comes from a landmark study that began more than 31 years ago in Quincy kindergartens, and continues with little fanfare today. The Simmons Longitudinal Study has followed more than 300 one-time kindergartners into adulthood, tracking them along the way, recording their childhood experiences, and matching that history against who they are in middle age. It is the nation’s longest running study of what determines good or bad mental health from childhood. Participants remain anonymous to everyone except each other and the researchers, who continue to observe how lives unfold - and every few years release a study on the lessons therein.