Question: Michael Dean Perry's older brother was a defensive lineman in the National Football League for how many seasons?

Context paragraphs:
Gary Baldinger: Gary Thomas Baldinger (born October 4, 1963) is a former professional American football player.  Baldinger, a defensive lineman, played six seasons in the National Football League, mainly for the Kansas City Chiefs.  His older brother Rich Baldinger was his teammate with the Chiefs and also played at Wake Forest.  His other brother Brian Baldinger also played in the NFL and currently is a broadcaster.

Nolan Harrison: Nolan Harrison III (born January 25, 1969 in Chicago, Illinois) is a former American football defensive lineman who played ten seasons in the National Football League for the Los Angeles/Oakland Raiders, the Pittsburgh Steelers, and the Washington Redskins.  He played college football at Indiana University and was team captain All Big 10 Honorable Mention.  Harrison was drafted in the sixth round of the 1991 NFL Draft.  Harrison was a member of the Delta Chi Fraternity while at IU and received The Distinguished Delta Chi Award from the national Delta Chi Fraternity in 1997.  He went to Homewood-Floosmoor High School in Flossmoor, Illinois and was a three-sport varsity letter winner in wrestling (185 pound weight class and heavyweight), track (400 m relay and mile relay) and football (defensive lineman) and in 2009 his high school football number was officially retired at a ceremony during the halftime of a McDonald's charitable basketball game being played by other former and current NFL players.

William Perry (American football): William Anthony Perry (born December 16, 1962) is a former American professional football player who was a defensive lineman in the National Football League (NFL) for ten seasons during the 1980s and 1990s.  Perry played college football for Clemson University, and was recognized as an All-American.  He was selected in the first round of the 1985 NFL Draft, and played professionally for the Chicago Bears and Philadelphia Eagles of the NFL.  In reference to his imposing size, he was popularly known as "The Refrigerator" or, abbreviated, "The Fridge".  Perry also occasionally played at fullback at the goal line due to his size and power.

Leonard Marshall: Leonard Allen Marshall Jr. (born October 22, 1961) is a former American football defensive lineman who played twelve seasons in the National Football League (NFL).  Selected 37th overall in the 1983 NFL Draft, he spent the first ten seasons of his career with the New York Giants where he accumulated 79.5 sacks, ranking him third in team history.  He was twice selected to the Pro Bowl and twice named NFL Defensive Lineman of the Year following the 1985 and 1986 seasons.  He won two championships with the Giants, recording three sacks in the two Super Bowl games which he played in.  Marshall is most famously known for his 1991 hit on Joe Montana that knocked him out of the NFC championship game.  After his time with the Giants, Marshall went on to play a season each for the New York Jets and Washington Redskins, then retired from football at the age of 33.  He played college football at Louisiana State University.

Patrick Graham (American football): Patrick Graham (born January 24, 1979) is an American football coach who is the defensive line coach for the New York Giants of the National Football League (NFL).  Graham played college football as a defensive lineman at Yale University, graduating with a bachelor's degree in sociology in 2002.  After his college football career, he worked as a graduate assistant at Wagner College while also studying for an MBA.  After two seasons at Wagner, Graham moved to the University of Richmond, where he was a defensive line coach in 2004 and then a tight ends coach in 2005 and 2006.  In 2007, he was a defensive graduate assistant under head coach Charlie Weis at the University of Notre Dame.  Following the 2008 season, Graham accepted a position as defensive line coach at the University of Toledo.  However, he left the school in February 2009 to join the New England Patriots as a defensive coaching assistant, where Weis had formerly been an assistant coach under Patriots head coach Bill Belichick.  In 2010, Graham's title was changed to defensive assistant coach.  He was promoted to linebackers coach in 2011.  In 2012, he moved to defensive line coach, and moved back to linebackers in 2014.  In 2016, he was hired by the New York Giants as defensive line coach.

Craig Walls: Craig S. Walls (born December 24, 1958) in Pittsburgh, Pennsylvania is a former American football offensive lineman/defensive lineman in the Arena Football League.  He also played linebacker in the United States Football League and the National Football League.  He played college football at Indiana University.

Corey Mayfield: Corey Mayfield is a former American football offensive lineman/defensive lineman and coach of the Arena Football League.  Mayfield is currently the Defensive Coordinator of the Texas Revolution of Champions Indoor Football (CIF).  Mayfield played in the National Football League and the Arena Football League.

Garry Howe: Garry William Howe Jr. (born June 20, 1968) is a former American professional football player who was a defensive lineman in the National Football League (NFL) and the World League of American Football (WLAF).  He played for the Pittsburgh Steelers, Cincinnati Bengals and Indianapolis Colts of the NFL, and the Frankfurt Galaxy and Amsterdam Admirals of the WLAF.  He also played fullback for the Iowa Barnstormers as well as defensive lineman from 1995 to 2000.  Howe played collegiately at Drake University and the University of Colorado.

Michael Dean Perry: Michael Dean Perry (born August 27, 1965) is a former American football defensive lineman and the younger brother of William Perry.  His parents are Mrs. Inez S. Perry [deceased] and Hollie Perry, Sr. of Aiken, South Carolina.  He learned to play football from his older brothers.  He attended South Aiken High School where he anchored the offensive and defensive line.  He played football at Clemson University and set the school record of 28 sacks (tied by defensive end Gaines Adams in 2006 and then broken by Vic Beasley in 2014).  He was later drafted by the Cleveland Browns in the second round of the 1988 NFL Draft.  He played in the Pro Bowl 6 times and played for the Browns, the Denver Broncos, and the Kansas City Chiefs over his 10-year career.

Myron Bell: Myron Bell (born September 15, 1971) is a former Safety in the NFL.  He played for the Pittsburgh Steelers and Cincinnati Bengals.  He started in Super Bowl XXX.  He is a member of the City of Toledo, Ohio Hall of Fame.  As a teenager he played at Macomber High School (class of 1989) where he made the All-American 1st team in the state of Ohio for high school football players and also made the city of Toledo, Ohio Hall of Fame.  He also teamed up with NBA star and Big Ten Network analyst Jim Jackson to win the 1988-89 OHSAA Division I basketball championship.  Right now, he coaches youth teams with close friends and former NFL football players Brentson Buckner and Adrian Murrell.  The youth football league they coach together is in a football league associated with former NFL football players Ethan Horton, Mike Minter, Michael Dean Perry, and Mike Rucker.  He has two children, Kennedy and Corey.  He works now as a security guard for West Mecklenburg High School in Charlotte, North Carolina

Supporting paragraphs: Michael Dean Perry William Perry (American football)
Answer: ten