They're the only two players in major league history to have hit 300 home runs and stolen 400 bases in a career.
2 of 14Mitchell Layton/Getty Images
Muhammed and Laila Ali
Laila's 2001 fight against Jackie Frazier-Lyde was dubbed Ali/Frazier IV, in honor of the three famous bouts between Laila's and Jackie's fathers, Muhammed and Joe.
3 of 14AP
Ken Griffey Sr. and Jr.
While playing together on the Mariners in 1990, the duo hit back-to-back homers, the only father-son pair in history to do so.
4 of 14Chris Graythen/Getty Images
Yannick and Joakim Noah
Championships run in this family: Yannick won the 1983 French open while Joakim led Florida to the past two NCAA men's basketball titles.
5 of 14AP
Al Unser Sr. and Jr.
Junior is halfway to his father's total of four Indianapolis 500 victories.
6 of 14AP
Bobby and Brett Hull
While playing for the Phoenix Coyotes, Brett wore his father's retired No. 9 Winnipeg Jets sweater for the final five games of his career.
7 of 14Walter Iooss Jr./SI, Greg Nelson/SI
Rick and Brent Barry
Brent, the second youngest of Hall of Famer Rick's four children, has had a more successful NBA career than his three brothers.
8 of 14Michael Montes/WireImage.com
Archie, Eli and Peyton Manning
Peyton's Colts are the reigning Super Bowl champs, but Eli, like his father Archie, starred at quarterback for Ole Miss.
9 of 14Andy Hayt/SI, Gary Bogdon/SI
Phil and Chris Simms
Finally realizing the expectations of his bloodline, Chris began 2006 as Tampa Bay's starting quarterback but was sidelined for the season after Game 3.
10 of 14AP
Mario, Michael and Marco Andretti
Like father, like son and grandson, the Adrettis are IRL/IndyCar royalty.
11 of 14Bob Rosato/SI, Doug Pensinger/Getty Images
John Thompson Jr. and III
The younger Thompson has revitalized the Georgetown basketball program his father once ran.
12 of 14Al Tielemans/SI, Manny Millan/SI
Patrick Ewing Sr. and Jr.
Like his father, Junior wears No. 33. Unlike his father, Junior plays small forward.
13 of 14AP
The Boone family -- including grandfather Ray, father Bob, and sons Bret and Aaron -- was the first to send three generations to the MLB All-Star game.
14 of 14Bill Frakes/SI
Between the four Pettys, Lee, Richard, Kyle and Adam amassed 263 victories in NASCAR. Great-grandfather Lee and his great grandson Adam passed away during the span of one month in 2000, Lee from natural causes and Adam in a tragic crash.
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