Police have been carrying out extensive enquiries to find the missing siblings. Officers say the search has been complicated with the closure of their school. It's thought the youngsters may try to travel by train to a previous holiday destination in Borth in Wales.
Police say they need help from the public to find them. Anyone with any information should contact police on 101.
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A senior employee at the organisation reportedly derided the three-year-old royal for being 'royal, rich' and "advantaged'.