By David Anderson Neil Sillett will be one of the proudest people at Wembley on Sunday when Coventry return in the FA Cup for the first time since his dad won the 1987 Final for the Sky Blues. Sillett was Coventry’s assistant physio when his dad John, together with George Curtis, beat Tottenham to achieve the greatest moment in the club’s 141-year history. Coventry’s 3-2 extra-time win remains one of the great FA Cup Finals and Spurs’ unfortunate Gary Mabbutt scored a decisive own goal after Dave Bennett and Keith Houchen had netted. Sillett recalls his dad joking to him that Spurs could repea…