A brewing case reported on in Gannett heirs sue over father’s estate is a good example of how even the best Florida firms are not immune to malpractice claims challenging a firm’s handling of a large estate. Two heirs to the Gannett newspaper fortune allege that West Palm Beach, Fla.-based Gunster Yoakley & Stewart colluded with its client JPMorgan Trust Co., a subsidiary of New York City-based JPMorgan Chase & Co., in running up fees for planning and administering the estate of their father, Charles McAdam Jr. of Wellington, who died in early 2003. That suit seeks no specific damage figure. But the plaintiffs maintain that Gunster’s actions cost the estate almost $8 million in legally avoidable taxes alone.