A DEVOTED father has revealed he discovered the three sons he had raised for more than 20 years were not his when doctors told him he had been infertile since birth.

Now Richard Mason’s ex- wife has been ordered to pay him £250,000 following an extraordinary legal case that has allowed her to keep the identity of the real father a secret.

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Mr Mason believes that the same man fathered all three boys during an intermittent four-year affair his wife Kate, 54, embarked on in the late 1990s.

But she only confessed to the adultery in 2016, ten years on from their divorce, when he confronted her about the children’s paternity.

It is not known if Mrs Mason’s former lover is aware he has three sons from the on- off relationship.