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Officially, one- Steve Largent. Several other Hall of Famers (Warren Moon for example) played for the Seahawks for at least one year during their careers but are installed under another team's name.
Steve Largent has 4 children, of which 3 are sons and the other is a daughter. Their names are Kramer James, Kyle, Kelly and Cassie.
4 total:Steve Largent,Carl Keller,Warren Moon and Franco Harris
Yes, many years now.
Once in 2006
The Seahawks average 68,000 fans a game
1996-present, about 14 years now.