Wiggins is the 2012 Tour de France winner and won the Olympic time trial gold medal at the London games.
"I don't know if the Tour de France and Olympic champion is going to crack," Dennis said. "He is a level above all of us."
"It's biking racing, it's never over," Kiel Reijnen said. "A mechanical in the wrong spot, a flat or a crash. It's easy to say on paper, but for most of us if we didn't believe we had a shot of winning we wouldn't be here."
Wiggins leads Dennis 24 seconds overall.
Celebrity Families of 2014 [PHOTOS]