Punk rock pioneer Patti Smith didn’t know who her biological father was until getting an assist from the daughter she put up for adoption decades earlier, she reveals in her new memoir, out Tuesday.

For years after a 2012 DNA test revealed that she and her sister, Linda, were but half-siblings, the two assumed what their maternal grandmother had long suspected — that Smith had actually been fathered by her mother’s uncle, she writes in “ Bread of Angels ,” published by Random House.

However, when they took an autosomal DNA test to go deeper into her mother’s side of the family, the half-sisters discovered that Smith’s father was “100% Ashkenazi,” Smith recounts of the results that arrived on her 70th birthday.

What followed was almost just as surprising. Smith had put a daughter u

See Full Page