. "Will contests, trust and fiduciary disputes and other probate and business litigation in the Dallas-Fort Worth Metroplex, Grayson County, Collin County, Dallas County, Fannin County, Cooke County, Hunt County, Lamar County, Tarrant County and Denton County - including the communities of Sherman, Denison, Dallas, Fort Worth, Bonham, McKinney, Plano, Denton, Gainesville, Paris and Van Alstyne." . . .