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The Crystal Cathedral’s attempt to cut costs for its Christmas and Easter pageants by hiring preacher Robert Schuller’s son-in-law, Paul David Dunn, has embittered some workers. Michael Coleman and Conwell Worthington, producers-directors who put on the “The Glory of Christmas” and “The Glory of Easter,” say they hold copyrights for the shows but haven’t received payment since Dunn was named director last year. Dunn said Wednesday the copyright belongs to him. Dunn already earns a salary as a researcher for Schuller’s “Hour of Power” TV ministry.