Charlton is related to several professional footballers on his mother's side of the family: his uncles were Jack Milburn (Leeds United and Bradford City), George Milburn (Leeds United and Chesterfield), Jim Milburn (Leeds United and Bradford City) and Stan Milburn (Chesterfield, Leicester City and Rochdale), and legendary Newcastle United and England footballer Jackie Milburn, was his mother's cousin. However, Charlton credits much of the early development of his career to his grandfather Tanner and his mother Cissie. His elder brother, Jack, initially worked as a miner before applying to the police, only to also become a professional footballer with Leeds United. His other brother, Tommy, plays walking football for the Mature Millers club in Rotherham.

He played in qualifiers for the 1962 World Cup in Chile against Luxembourg and Portugal and was named in the squad for the finals themselves. His goal in the 3-1 group win over Argentina was his 25th for England in just 38 appearances, and he was still only 24 years old, but his individual success could not be replicated by that of the team, which was eliminated in the quarter final by Brazil, who went on to win the tournament.  By now, England were coached by Alf Ramsey who had managed to gain sole control of the recruitment and team selection procedure from the committee-based call-up system which had lasted up to the previous World Cup. Ramsey had already cleared out some of the older players who had been reliant on the loyalty of the committee for their continued selection - it was well known that decorum on the pitch at club level had been just as big a factor in playing for England as ability and form. Luckily for Charlton, he had all three. A hat-trick in the 8-1 rout of Switzerland in June 1963 took Charlton's England goal tally to 30, equalling the record jointly held by Tom Finney and Nat Lofthouse and Charlton's 31st goal against Wales in October the same year gave him the record alone.  Charlton's role was developing from traditional inside-forward to what today would be termed an attacking midfield player, with Ramsey planning to build the team for the 1966 World Cup around him. When England beat the USA 10-0 in a friendly on 27 May 1964, he scored one goal, his 33rd at senior level for England.  His goals became a little less frequent, and indeed Jimmy Greaves, playing purely as a striker, would overtake Charlton's England tally in October 1964. Nevertheless, he was still scoring and creating freely and as the tournament was about to start, he was expected to become one of its stars and galvanise his established reputation as one of the world's best footballers.

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Charlton's role was developing from traditional inside-forward to what today would be termed an attacking midfield player,