Duerson kin to contest NFL concussion dealPHILADELPHIA — The family of the late NFL safety Dave Duerson plans to appeal terms of this week’s class-action concussion settlement “sooner rather than later.”Family lawyer Thomas A. Demetrio objects to the exclusion of future awards for CTE, the brain trauma that some call “the signature disease of football.”Lawyers involved in the settlement say an appeal could hold up payments to thousands of players.Some are suffering from Alzheimer’s …