My Architect (movie, 2003)

World-famous architect Louis Kahn (Exeter Library, Salk Institute, Bangladeshi Capitol Building) had two illegitimate children with two different women outside of his marriage. Son Nathaniel always hoped that someday his father would come and live with him and his mother, but Kahn never left his wife. Instead, Kahn was found dead in a men's room in Penn Station when Nathaniel was only 11.