Lane was the adoptive grandmother and mentor to Roger Lea MacBride, later the Libertarian Party's 1976 candidate for president. The son of one of her editors with whom she formed a close bond when he was a boy, Lane later stated she was grooming him to be a future Libertarian thought leader. In addition to being her close friend, MacBride became her attorney and business manager and ultimately the heir to the Little House series and the multimillion-dollar franchise that he built around it after her death.