SOUTHAM TO SELL 49 PCT INTEREST IN BRANDON SUN <Southam Inc> said it agreed to sell its 49 pct interest in Sun Publishing Co Ltd, which publishes The Brandon Sun, to majority shareholder publisher Lewis D. Whitehead. Terms were not disclosed. Southam said the proposed sale resulted from an offer made by Whitehead, whose family has had majority control of the newspaper since 1905. The Brandon Sun has daily circulation of 19,100.