The condition the three children were suffering from meant they were unable to talk or walk and were slowly dying.
It has been described as an incredibly debilitating disorder.
The four-year-old girl was diagnosed first followed by the younger twin boys.
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Aydin Onac has been suspended from his role at St Olave's Grammar School in Orpington.
Leaders of the Aslef union are recommending that their members accept the deal.
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