Getty Kansas City Chiefs quarterback Patrick Mahomes has a football playing half-brother in Graham Walker from Rice University. They say that athleticism often runs in the family, and that’s the case with Kansas City Chiefs quarterback  Patrick Mahomes , who has a football playing half-brother in Graham Walker from Rice University . Even though Walker didn’t get drafted in the 2025 NFL draft , that doesn’t mean his football career is over. As with many of the players who didn’t get a phone call