The Lost Sons is a 2021 American-British documentary film, directed by Ursula Macfarlane and premiered at South by Southwest on March 16.
It follows Paul Fronczak, a man who discovers he had been abandoned as a child and mistakenly returned to another family whose young son was missing, then learns the identity his biological mother gave him and the whereabouts of the "real" Paul Fronczak.
[1] The film follows, and is largely narrated by, a man who was raised as "Paul Fronczak" by a Chicago couple whom he was led to believe were his biological parents.
Born in 1964, he stumbled across newspaper clippings at his family home when he was 10 years old.
The news reports featured his parents grieving over a kidnapped baby son, then celebrating when he was recovered two years later, apparently abandoned by the kidnapper.