Several weeks after the two top executives of Boston Bancorp resigned, the embattled company is suing the former president's brother, accusing him of grossly overcharging the thrift company by at least $80,000 in brokerage fees.

The $2 billion-asset company claims Lloyd W. Archibald and his firm, Schneider Securities Inc., violated a 1993 agreement to charge no more than 8.5 cents per share for stock transactions on behalf of the thrift.

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