Harriman left $65 million when he died in 1986; his wife got half the estate. The lawsuit involves a $13 million trust set up for his two daughters and six grandchildren. They charge that Pam and the fund’s trustees made risky investments that reduced the fund to a mere $3 million in 1994. Mrs. Harriman has not filed a formal response, but her lawyer said she “regrets” the heirs’ decision to sue.