Clay Matthews Sr., football family patriarch, dies at 88
Clay, Jake Matthews extend reign of NFL's first family third generation - ESPN
Matthew Slater - Wikipedia
Clay Matthews Sr. has passed away. He was the patriarch of the NFL's greatest bloodline. : r/GreenBayPackers
How an assist from Brice Matthews helped land Nebraska baseball a commitment
For Matthews Clan, N.F.L. Is All in the Family - The New York Times
Clay Matthews Sr., football family patriarch, dies at 88
The 1979 USC football team had some kind of talent … and some regret - The Athletic
Clay Matthews, Sr. (Legacy) - SC Football Hall of Fame