Florence Fang and other members of her family are suing to regain control of the San Francisco Examiner and other publishing assets, alleging they were misled into a $20 million sale last year by the betrayal of a former executive, Scott McKibben. The Fang family, which owned the Examiner for three years, wants a San Mateo County Superior Court judge to nullify the paper’s sale to Denver billionaire Philip Anschutz as part of a lawsuit filed against Anschutz and the paper’s current publisher, McKibben. Before Anschutz bought the Examiner 11 months ago, McKibben oversaw the paper for the Fangs.