Members of Canadian family known for its philanthropy and support of the arts in the Niagara region of Ontario were killed Monday in a Greenville plane crash, the cause of which is still being investigated. Police in Greenville on Tuesday identified Joseph Robertson, 58, as the pilot of the plane. His wife, Anita Robertson, 58, and their daughter, Laura Robertson, 24, were passengers. The Robertsons were residents of Niagara-on-the-Lake, Ontario, and longtime supporters of the arts and community in neighboring St.