Since taking control of the oil workers union, Romero’s grown children have demonstrated their own ability to come into vast resources.

Romero’s son and daughter-in-law, Jose Carlos Romero Duran and Maria Fernanda Ocejo, own two spacious condos on Miami Beach’s “millionaires row” worth a combined $7 million. One of the units, at 5959 Collins Avenue, has soaring views from the 30th floor.

In the parking lot is a red Ferrari Enzo, a sports car worth more than $1 million, a gift from his father. Tabasco Hoy, a newspaper in the oil-rich state of the same name, last month published a report saying that it spotted two other cars in the dedicated parking spots for the couple’s Florida condos: a Porsche Carrera 911 and a Lamborghini Aventador LP700-4, a 700-horsepower “hypercar” that pops 0-60 miles per hour in 2.9 seconds.

Romero’s union was created and sponsored by the PRI during its rule last century, and it did yeoman’s work to back the party. In 2000, Romero was linked to a scandal in which electoral authorities found that his union funneled nearly $100 million to the losing campaign of PRI presidential candidate Francisco Labastida – the first time a PRI candidate had lost. Still, Romero made the list of PRI candidates for the last Senate elections July 1 and handily won a six-year term.

Other top PRI elected officials, including the party’s former secretary general, face corruption accusations.

Among them is Andres Granier, who left the governorship of Tabasco state in December amid reports that his administration had borrowed and not accounted for 1.9 billion pesos (about $148 million). The state congress last week asked the federal comptroller to audit the books of Granier’s final year in office.

Granier’s children are also under the magnifying glass. Authorities have frozen an account of daughter Mariana to investigate the provenance of 14 million pesos (slightly more than $1 million). Records show a son, Fabian, bought a condo in Miami’s North Bay Village in 2011, and 10 more condos in Cancun’s Emerald Tower.

So far, Humberto Moreira, a secretary general of the PRI for nine months in 2011, has gotten off the hook for the messy financial problems of his home state, Coahuila, where he was governor from 2005-2011.

Moreira, a former high school teacher, saddled the state with a whopping additional $3 billion of debt, and the federal attorney general later issued arrest warrants for five former state officials, including the tax chief and treasurer, in a corruption probe.

Last month, U.S. prosecutors tracked down $2.2 million in a Bermuda bank account controlled by the fugitive former treasurer, Hector Javier Villarreal.

Prosecutors have told Mexican media they don’t have enough evidence to indict Moreira, who left Mexico in January to spend a year in Madrid to get a master’s degree in history. Aides said he won a scholarship from the national teachers union to pay for his studies.