The California Court of Appeal upheld a lower court's decision to dismiss a lawsuit filed by Isaac Musighi against the attorneys representing his estranged brother, Parviz "Daniel" Mossighi. The court ruled that Musighi's claims were meritless and protected under California's anti-SLAPP law, which aims to prevent strategic lawsuits against public participation. This ruling affects Musighi, who has been embroiled in legal disputes with his brother since their jewelry business dissolved in 2013.

The case, Musighi v. Graham, docket number B349470, centers around a long-standing feud between two brothers who operated a wholesale diamond business together for decades. After deciding to part ways in 2013, the brothers entered arbitration to resolve the division of their business assets. Isaac, dissatisfied with the arbitration results, has since filed multiple lawsuits against his brother and others involved in the arbitration, including the attorneys who represented Daniel.

The arbitration process began in November 2016 when both brothers agreed to have a senior member of Diamond Club West Coast Inc. arbitrate their business asset division. Isaac won the auction for the business but was required to pay Daniel over $9 million to equalize the assets. Following a second arbitration in 2017, an amended award was issued, which was nearly identical to the original award but adjusted the payment plan and required Isaac to deliver a prized blue diamond to Daniel for a joint sale.

In September 2017, Daniel petitioned the trial court to confirm the amended arbitration award. Isaac opposed this petition, claiming it was secured through fraud. The trial court confirmed the award and reduced it to a judgment. Since then, Isaac has filed numerous lawsuits challenging this judgment and the agreements he reached with Daniel.

In March 2025, Isaac filed a lawsuit against Daniel's attorneys, Curtis Graham and Dawn B. Eyerly, and their law firm, Saul Ewing, LLP. He alleged that they abused the judicial process and participated in fraudulent schemes that deprived him of his rights and business interests. Isaac's claims included abuse of process, fraud upon the court, and intentional interference with prospective economic advantage.

The defendants responded by filing a special motion to strike Isaac's complaint under California's anti-SLAPP law, arguing that his claims arose from their protected activity in representing Daniel during the arbitration confirmation process. The trial court agreed, granting the motion to dismiss and awarding the defendants attorney fees.

The Court of Appeal affirmed the trial court's decision, stating, "Isaac’s claims arise from protected activity." The court explained that the defendants' actions in seeking confirmation of the arbitration award were protected under the anti-SLAPP statute, which aims to prevent meritless claims that arise from free speech or petitioning rights. The court noted that Isaac failed to demonstrate that his claims had minimal merit.

In addition to affirming the dismissal of Isaac's lawsuit, the court also upheld the award of attorney fees to the defendants. The defendants had requested $23,562 in fees and costs, which the trial court granted after determining that the amount was reasonable given the complexity of Isaac's claims and the extensive legal history involved.

The ruling reinforces the protections provided by California's anti-SLAPP law, which is designed to quickly dismiss lawsuits that attempt to silence or intimidate individuals from exercising their rights to free speech and petitioning. This case highlights the challenges faced by individuals who engage in prolonged legal battles, especially when their claims are perceived as lacking merit.

Moving forward, Isaac Musighi's options for appeal are limited, as the Court of Appeal has affirmed the lower court's decisions. There are no indications of related pending cases, and the court's ruling sets a precedent for similar future cases involving anti-SLAPP motions.