Nine-year-old William Kulk died in hospital on Sunday night . His eight-year-old sister Piper died on Sunday morning . They were both involved in a horrific car crash on the NSW Central Coast . more than $ 32,000 has been raised to help the devastated family . Were travelling with elder brother , mother and grandmother . They had spent the day at the Royal Easter Show in Sydney . Their brother Daniel , 12 , is in a stable condition in Westmead hospital .
Nine-year-old William Kulk died in hospital on Sunday night . His eight-year-old sister Piper died on Sunday morning . They were both involved in a horrific car crash on the NSW Central Coast . Over $ 32,000 has been raised to help the devastated family . Were travelling with elder brother , mother and grandmother . They had spent the day at the Royal Easter Show in Sydney . Their brother Daniel , 12 , is in a stable condition in Westmead hospital .