piper kulk , 8 , on the right of the family snap caption ` our babies ' , died on sunday morning , hours after the accident on the nsw central coast , when the car being driven by their grandmother , helen boddy , 54 , aqua-planed and swerved into the path of an oncoming ute .
piper 's brother william 9 , on the left of the image , died in hospital on sunday evening .
together with their older brother daniel , 12 , and mother chantelle , 31 , they had spent the day at the royal easter show in sydney .