A.B. Quintanilla III, the brother of late Tejano star Selena Quintanilla, is escalating a public dispute with his sister Suzette Quintanilla Arriaga, claiming that she and her attorneys were notified of legal action involving her fiduciary responsibilities.
The dispute became public on Sept. 1, when A.B. said on Instagram that he was involved in a lawsuit concerning Suzette and circumstances connected to their late father, Abraham Quintanilla Jr., who died in December 2025. A.B. said the matter followed years of accumulated family issues and that there were facts and evidence that had not yet been made public.
On Sept. 2, Suzette and her mother, Marcella Quintanilla, responded with a joint statement disputing A.B.’s claims. They said they had not been served with a lawsuit and could not locate a court-filed complaint, summons, petition or other legal pleading matching the allegations. They also denied that Suzette had stolen, misappropriated or improperly taken money or property belonging to members of the family, Selena’s estate or family-owned businesses.
Suzette and Marcella also rejected suggestions surrounding Selena’s personal belongings, stating that Suzette was not selling and had no intention of selling the late singer’s personal items. They further said they were unaware of wrongdoing by Abraham that would support the allegations A.B. appeared to be making about their father.
A.B. subsequently responded, saying, “I don’t lie,” and maintaining that Suzette and her lawyers had received documents through certified mail and email. According to A.B., the legal matter concerns Suzette’s fiduciary duties, which he described as obligations involving loyalty, transparency and acting in the interests of those she was responsible for.
A.B. also alleged that Suzette responded to his legal team but did not provide contracts, documentation and financial information that had been requested. He said those requests remained unanswered.
The exact legal status of the alleged lawsuit remains disputed. Billboard reported that its searches of publicly available court records in several jurisdictions, including Los Angeles, New York, Delaware, federal courts and Nueces County, Texas, did not locate a publicly available court filing matching A.B.’s description. The outlet also noted that a heavily redacted document A.B. shared appeared to be a cease-and-desist letter rather than a lawsuit and referenced alleged disregard of fiduciary duties to estate beneficiaries.
A.B. has said that his attorney will publicly address the matter on Friday, Sept. 4, promising that “many things will be made clear.”
The latest exchange has placed the long-running Quintanilla family relationship and the management of matters connected to Selena’s legacy back into public attention. For now, A.B. maintains that Suzette was notified of legal action, while Suzette and Marcella maintain that they have not been served with a formal lawsuit and deny the allegations surrounding theft or financial misconduct.
