It left Peter, his wife Emma and Georgina's three siblings 'utterly devastated'.
Now, eight years on, Peter wants to ensure no other parent goes through the same trauma.
He and his wife started the Georgina Josephine Foundation,which helps other families suffering similar tragedies and educates drivers.
'We want people to be inspired to change, not to think we are brave,' Peter said. 'We can’t improve the situation for us, but we can try to make it better for other people.'
The foundation also works to prevent the amount of low-speed deaths caused by vehicles in Australia, which they estimate is one per month.
In 2019 alone, nine children have died in devastatingly similar circumstances.
'We made a promise to Georgy we would do our best to prevent it from happening to anybody,' Peter adds.
'It keeps her alive for us, we don't forget about her, the whole family helps with these events, and the kids. We treat it as spending time with Georgy even though we can't physically be with her.'