Question: Buddy Ryan, the father of Rob Ryan were both coaches in which national sports league?
Context: Rob Ryan (born 1962) is a British visual artist who specialises in papercutting and screen-printing.  He is now most famous for his detailed paper cut outs.  His artwork has featured in "Vogue", "Elle", and "Stylist".  He has also collaborated with fashion designer Paul Smith. Rob Ryan (born June 24, 1973 in Havre, Montana) is a former outfielder in Major League Baseball who played for the Arizona Diamondbacks and the Oakland Athletics.  He attended Washington State University where he played college baseball for the Cougars from 1993–1996, and was drafted by the Diamondbacks in the 26th round (785th overall pick) of the 1996 Major League Baseball Draft.  He signed with the Diamondbacks two days later on June 6.  Ryan, who batted and threw left-handed, was listed at 5' 11" in height, and 192 lb in weight. Rob Ryan (born 1948) is the founder, past chairman and CEO of Ascend Communications, and currently mentors entrepreneurs through his Entrepreneur America Mentors' bootcamps at his ranch in Montana.  Ryan earned national attention when he grew his 1989 start-up company, Ascend Communications, to more than $2 billion in sales.  Lucent Technologies acquired Ascend in 1999 for $24 billion in what was termed at the time the "largest technology merger ever. "This sale still ranks as the largest technology merger today in the US. The 1994 Arizona Cardinals season was the team's 75th season with the National Football League, the seventh season in Arizona and the first season as the Arizona Cardinals.  Buddy Ryan became the 32nd head coach in Cardinals history.  After being given a large share of the credit for the success of the Houston Oilers in 1993, Ryan was named head coach of the Arizona Cardinals in 1994.  Also named general manager of the Cardinals, Ryan went 8–8 his first year, the Cardinals' first non-losing season since 1984. The 2015 New Orleans Saints season was the franchise's 49th season in the National Football League, the 40th to host games at the Mercedes-Benz Superdome and the ninth under head coach Sean Payton.  On November 16, 2015, the Saints hired Dennis Allen to replace the fired Rob Ryan.  However, the Saints still missed the playoffs for the 2nd consecutive season.  The Saints set a new league record for the most passing touchdowns allowed with 45. Rob Ryan is the co-owner of the Las Vegas Locomotives and a member of the Board of Directors for the United Football League. James David "Buddy" Ryan (February 17, 1931 – June 28, 2016) was an American football coach in the National Football League (NFL) and American Football League (AFL).  During his 35-season coaching career, Ryan served as the head coach of the Philadelphia Eagles and Arizona Cardinals, and the defensive coordinator of the Chicago Bears and Houston Oilers of the NFL. Texas is home of several national sports league franchises among other professional sports, being the second most populated U.S. state.  Since the state is located in the South Central United States, most teams are part of the Central / South or West league divisions, with the notable exception of the NFL Dallas Cowboys, which is an NFC East franchise. Dale Haupt (born April 12, 1929) is an American football coach who served as the defensive line coach for the Chicago Bears of the National Football League (NFL), winning a Super Bowl with them in 1985.  In 1986, Haupt joined Bears defensive coordinator Buddy Ryan in leaving the team to join the Philadelphia Eagles, and was replaced by John Levra.  He served the Eagles until his retirement in 1995.  He was hired by the Coast Guard Academy in 1997, reuniting him with former Bears coach Jim LaRue.  Haupt has worked with Buddy Ryan with the NFLPA Game. Robert Allen Ryan (born December 13, 1962) is an American football coach in the National Football League (NFL).  He has served as a defensive coordinator or coach for seven different NFL teams, and served as the linebackers coach for the New England Patriots when they won both Super Bowl XXXVI and Super Bowl XXXVIII.  He is the son of former defensive coordinator and head coach Buddy Ryan and the twin brother of Rex Ryan.
Answer: National Football League (NFL)