Ladbrokes, which operates more than 2,800 betting shops in the United Kingdom, Ireland, Belgium and Spain, said Wednesday it was offering odds of 10,000 to 1 for the four Federer siblings to someday meet up in a mixed doubles Wimbledon final.
Due to the high odds on the bet, Labrokes spokeswoman Jessica Bridge told ESPN.com that the maximum wager allowed will be 10 pounds ($17).
"Not too surprisingly we haven't seen a single bet yet, as you're going to need to wait about 20 years to collect any winnings," she said.
Ladbrokes also issued odds on any of the Federer children to win a Wimbledon singles title (100-1) or any combination of the Federer children to win a Wimbledon doubles title (33-1).
Gamblers are being offered a non-tennis bet, as well. The odds of the Federers having a third set of twins has been set by the company at 1,000-1.