I'm going with the Manning Family...Archie, Peyton, Eli..and I believe there was another brother who as athletically gifted as them, but got hurt or something. But that's some major talent in that family.
Danny and Eric Ainge... just playing, they suck. Especially daddy. Cuttino Mobley and John Mobley? Sam Cassell, and ET. Phil Simms, and Phil Simms son. As for wrestling, i'll take the Guerreros. The Anvil is not a direct line of the Harts. He is/was married to a Hart sister. The same for Davey Boy Smith. He is/was married to a Hart family member. His son Harry, is trying to learn the wrestling trade.
My bad, their grandmothers were cousins so they are very distant cousins. http://www.jockbio.com/Bios/McGrady/McGrady_bio.html
I didn't know BBQ eating contests counted as athletic competitions? Didn't three brothers all play in the same outfield one time? John and Brent's father is Rick, the greatest free throw shooter of all time...