Though Jack Jr. is more well-known thanks to Masters and PGA Championship conquests, Jack Sr. had his own share of fortune on the fairways, finishing second in the 1920 U.S. Open.
Old and Young Tom Morris
Old Tom is considered the godfather of St. Andrews, the founder of modern groundskeeping and an innovate club maker. Oh, and judging by his four Open belts, a pretty damn good player. Young Tom was one of the first "young guns" of golf, winning four straight Open championships, his first at age 17.
Willie Park Jr. and Sr.
The older Park was the inaugural winner of the British Open, and won four belts in his career. His son, Willie Jr., boasted two Open Championships of his own, but was also a world-class architect (designing U.S. Open venue Olympia Fields) and writer to boot.
Julius and Guy Boros
Julius owned one of the sweetest swings in golf history. Coupled with an out-of-this-world short game, Julius won three majors in his career. Moreover, he was one of the pioneers of the Senior Tour. His son, Guy, was a journeyman on the PGA Tour, highlighted by a victory at the 1996 Greater Vancouver Open.
Bing and Nathaniel Crosby
Bing, a movie and music star, found his true love in golf. He competed in the U.S. and British Amateurs, and started the "Crosby Clambake" in 1937, a tournament featuring the top names in golf and entertainment. The event eventually became the Pebble Beach National Pro-Am. His son, Nathaniel, won the 1981 U.S. Amateur, and played in the Walker Cup.
Al and Brent Geiberger
Al won 11 times on tour, including the 1966 PGA Championship, but he's mostly known as the first player on the PGA Tour to shoot 59. His son, Brent, won twice at the top level, with victories at the 1999 Greater Hartford Open and the 2004 Greensboro Classic.
Jack and Gary Nicklaus
Gary spent three years on tour, with his best showing a second-place finish to Phil Mickelson in the 2000 BellSouth Classic, and appeared on the cover of Sports Illustrated as a 16-year-old. According to Wikipedia, his father, Jack, also experienced a modicum of achievement.
Bob and David Duval
David, the former No. 1 player in the world, is the famous face of the clan, but Bob is no slouch. A former club professional, Bob joined the Senior PGA Tour and won the 1999 Emerald Coast Classic the same day David captured the Players Championship.
Craig and Kevin Stadler
Craig won 13 times on tour, including the 1982 Masters, and has nine Champions Tour victories to his credit. Although he hasn't found the same success, Kevin has enjoyed a prosperous career, highlighted by a win at the 2014 Waste Management Open.
Jay and Bill Haas
Jay won nine times on tour, but has found more success on the Champions Tour, with 17 wins on the senior circuit. Bill's resume is not too shabby either, with six PGA Tour wins, including the FedEx Cup on his trophy mantle. Jay and Bill were together at the 2015 Presidents Cup, where Jay was the captain and Bill was a clutch-performing captain's pick.