The board of trustees has now sent out a survey to all parents, after the Wymans expressed fears that the radiation effect of wi-fi could be linked to cancer.

But the Ministry of Education, which has been at community meetings held by the school alongside the Ministry of Health, says research shows wi-fi is safe.

Damon Wyman, who still has two children at the school, says Ethan was diagnosed with the tumours three months after he was given a wi-fi-connected iPod.