He looks over the millions of dollars of restoration underway at the historic Napa Valley operation and recalls how his grandparents worked so hard to reestablish the Charles Krug wine label.
"They were doing this in the 1940s and 1950s when our own family name had no significance in the wine business," Mondavi said.
Now Mondavi and his brother Marc are in possession of some of California's greatest wine assets, including more than 500 acres of prime Napa Valley vineyards and a landmark winery. In a twist of fate, they are the last branch of the family that still owns the right to put the Mondavi name on a wine label.
Together, they are leading a resurgence of the Krug winery and the Mondavi labels it produces. Their premium Charles Krug Peter Mondavi Family wines have won favorable reviews in recent years and are selling out months in advance of the new vintage's annual release, a healthy sign for a winery.
Their less expensive CK Mondavi also is gaining in the face of stiff competition from industry giants E&J Gallo Winery of Modesto and San Francisco-based Wine Group, billion-dollar companies with offerings in the same price range.
Although profitable, the brothers' winery, known formally as C. Mondavi & Sons, is tiny by comparison, garnering just $60 million in annual sales. It has 100 employees.
The Mondavis trace their wine roots back to grandfather and patriarch Cesare Mondavi. He was one of the first to recognize the value of Napa Valley after Prohibition ended. After buying a small winery in the region in 1937, he purchased Charles Krug Winery -- Napa Valley's oldest -- for $75,000 in 1943.
His son Peter Mondavi Sr. experimented with different white wine cold fermentation techniques and was an early advocate of aging wine in imported French oak barrels, now industry standards. Robert Mondavi, the older son, proved that Napa Valley could compete with the great wine regions of France and made the Mondavi name synonymous with fine California wine.
Then the family fell victim to California wine society's version of a Shakespearean tragedy.
Robert and Peter couldn't get along after Cesare's death in 1959 and the elevation of his wife and their mother Rosa to president. While Robert took over as general manager, he chaffed at the criticism Peter heaped on his management style and business plans. During one argument, Robert struck Peter. Rosa put a stop to the fighting by making Robert take a six-month leave of absence with pay.
Robert never came back. He borrowed money to buy choice vineyard property in Oakville and opened what became Robert Mondavi Corp. in 1966. That winery flourished and transformed the Mondavi name into a wine legend. Peter Mondavi's Charles Krug business lived on in mediocrity.
It was a big fall for the Krug winery, which before the brothers' breakup "was one of the leading labels in Napa Valley," said Darrell Corti, a longtime wine judge and gourmet foods merchant who runs Corti Bros. in Sacramento. For decades Krug produced few notable wines, Corti said.
"We fell behind," Peter Mondavi Jr. said.
The ascendancy of the Robert Mondavi side of the family would last for more than three decades. But then infighting between Robert Mondavi and his sons combined with poor management and financial choices to destroy the new Mondavi empire.
Constellation Brands Inc., the world's largest wine company, acquired Robert Mondavi Corp. and the right to use the Mondavi name for $1 billion in 2004.
There was nothing in the transaction to stop the other side of the family from using the equity built up in the Mondavi name to help push their wines. When Cesare Mondavi's grandson meets with restaurateurs and retailers he introduces himself as Peter Mondavi and asks if they would like to "try some of my family's wine."
The wine is something he is proud of. Mondavi started working at the winery when he was 8 years old, unwrapping glasses purchased for the tasting room. He joined the business full time after graduating from Stanford University in 1981. There are 400 wineries in Napa Valley, he observed, but only three are still in the hands of the same families that helped restart the area's wine business after Prohibition: the Nicolinis, the Trincheros and his side of the Mondavis.
"We are still one of the lower-priced wines in Napa Valley, but as our quality has improved, pricing has followed," Peter Mondavi Jr. said.