As Silent says, George was an absolute gent, a lovely bloke and very knowledgable re the Blades in the 60's.
Once United released the twins, they flirted with non league briefly and George (I think) had a spell at Doncaster.
Time in local league football was brief for them both as they struggled weight wise and consequently with knee troubles.
George had a spell managing Arbourthorne EA and always followed them throughout 70s/80s.
Bill was the quieter of the two and remained single up to his death.
As schoolboys and products of Wybourn Sec school they both played for Sheffield Schools U15 where I first saw them play on the Ball Inn. They were outstanding prospects, both strong, skilful and visionary.
However their weight gain was always against them. Maybe today's better nutrional standards in the game may have seen them prosper more.