STOCKHOLM — Legendary Swedish film director Ingmar Bergman was switched at birth, according to DNA test results released yesterday by his niece.

The analysis showed that Bergman, who died in 2007, and his mother, Karin, were not biologically related.

Bergman’s niece, Veronica Ralston, discusses how this may have come to be in her new book, “The Love Child and the Changeling.”