<p>On Father's Day, the Duke and Duchess of Cambridge's eldest children Prince George and Princess Charlotte spent time with their father Prince William at a half marathon event in Sandringham, Norfolk. </p><p>The seven and six-year-old helped their Dad count down from 10 at the start line (which they did three times to account for a socially distanced race) and were captured by photographer Ian Burt.</p>
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