The parents of a four-year-old who was diagnosed with a rare brain tumour last year have said they are "crying with happiness" after the cast of The Big Bang Theory sent their son a special message.

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The 'Big Bang Theory' star topped the Forbes list with earnings of $29 million (€25.72m) for his role as Sheldon Cooper whilst his co-star Johnny Galecki, who plays Dr. Leonard Hofstadter, earned $27 million.