Final answer:
The information provided does not directly address how Selena's father discovered something wrong with the family's money, and it may refer to the historical case of singer Selena Quintanilla-Pérez. Typically, financial issues may be discovered through audits or discrepancies in financial documents.
Step-by-step explanation:
The question relates to how Selena's father discovered issues with the family's finances. This is not directly addressed in the information provided about Dr. Money and the case of Brenda, nor is it related to the quotes from different contexts. If the student is referring to the American Tejano singer, Selena Quintanilla-Pérez, and the troubles her family encountered with their financial manager, it would be a matter of public historical record rather than the fictional or unrelated examples given here. Typically, in such cases, financial discrepancies might be discovered through audits, financial statements discrepancies, or unaccounted expenses. However, the actual methods of discovery would need to be confirmed from accurate sources specific to Selena Quintanilla-Pérez's family's situation if that is the intended focus.