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The ceremony is scheduled for 4 p.m. at the Lafayette County Courthouse in Oxford.
Retired Court of Appeals Judge Thomas A. Coleman, Josiah Coleman's father, will administer the oath of office.
Coleman, 40, of Toccopola, won election last fall to succeed former Presiding Justice George C. Carlson Jr., who retired.
Coleman is the second member of his family to serve on the Mississippi Supreme Court. He is the grandson of the late Gov. J.P. Coleman, who also served on the 5th U.S. Circuit Court of Appeals. J.P. Coleman served briefly as a justice of the Mississippi Supreme Court, resigning to accept appointment as state attorney general.