'Love you to Pluto': Manilla mourns beautiful children Bradley Russell and Emmanuella Russell after horror Central Mangrove car crash

The community has rushed to the side of father Michael Russell, who lost son Bradley Russell, 10, and daughter Emmanuella Russell, six, in the fatal accident on Tuesday.

Mr Russell's sister Rebecca Riley said both children were kindhearted kids with "so much love to give", ripped from their family and the Manilla community far too soon.

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"Bradley was just a gentle soul," she said.

"Emmanuella showed so much love. She told [my] mum she loved her to Pluto and back so many times, that was her and my mum's saying, 'I love you to Pluto and back.'"

It's impossible to put the grief the family feels into words, Ms Riley said.

"No words can describe the devastation," she said.

"Not only for Michael but for my mum and dad. We're a very, very connected family.

"But there's just no words that can describe the feeling. The amount of tears that have been shed and they're never going to stop. It's hard, it's really hard."

The community of Manilla has been "unbelievable" and have helped Michael and the family keep going, Ms Riley said.

Just a day after it was created, more than $21,000 had already been donated to the family to pay for funeral and other costs, through a GoFundMe page as of Friday afternoon. The family asked for just $15,000.

"We're related to two-thirds of that town in one way or another. It's just the way we are, we all pull together when times are tough and help each other out," she said.

"The numerous messages and the emails and messages from messenger that we've received as a whole family is amazing."

Samantha Smith, 32, was driving with five children in the car when it veered off the road at Central Mangrove, near Gosford.

Three children were injured in the accident. One of the brothers was hospitalised with cuts and bruises and emotional injuries, but has since returned home from the Central Coast.

It's not yet clear when the children's funeral, which will be held in Manilla, will take place. Police are still investigating the circumstances surrounding the crash.

People can donate to the family's funeral expenses at a GoFundMe set up by Jamie Russell.

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