A unanimous panel of the 4th District Court of Appeal upheld a $1 million legal malpractice judgment against the law firm Gunster Yoakley & Stewart awarded to the heirs of the Gannett newspaper fortune.

The case arose from a dispute over the estate of Charles V. McAdam Jr., a wealthy Palm Beach, Fla., resident who was married to Sarah Gannett — daughter of Frank Gannett, the founder of one of the largest newspaper chains in the country. His two sons sued Gunster, shareholder Daniel A. Hanley and JPMorgan for breach of fiduciary duty, constructive fraud, civil conspiracy and unjust enrichment.