Hannah Clarke planned writing a new will just days before being killed in a car fire alongside her children, her devastated mother has claimed.

Former rugby league player Rowan Baxter, who played for the New Zealand Warriors in the NRL, is alleged to have doused a car in petrol before setting it alight in an incident which killed the couple and their three children in Brisbane on Wednesday.

Eyewitnesses reported Hannah Clarke jumping from the burning vehicle in flames shouting "he poured petrol on me" before a neighbour rushed to her aid.

She was rushed to the Royal Brisbane and Women's hospital where she died later on Wednesday evening.

Rowan Baxter's wife, Hannah, planned to write a new will days before her death

Rowan Baxter is alleged to have returned to the burning vehicle after he had set it on fire before stabbing himself in the chest, being pronounced dead at the scene alongside children Aaliyah, six, Laianah, four and Trey, three.

Clarke's family have branded their estranged son-in-law "scum" and a "monster" - and it has now been claimed she suffered decade-long abuse and feared for her life days before being killed.

In an emotional with 'A Current Affair' in Australia, heartbroken mum Suzanne said: "She said to me only last week, 'Mum should I do a will?'

The family were all killed as a result of a car fire in Brisbane on Wednesday

"'What happens to my babies if he kills me? Because he'll go to jail for murder, who gets my children?'

"She said: 'I want you and dad to have them or Nat. I don't want his family to have them.'"

Her father, Lloyd, labelled her a fantastic and devoted mother.

He said: "She did everything for those kids.

Baxter previously played Rugby League for the New Zealand Warriors in the NRL

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"To the end she fought to make sure if he survived he got punished for what he was doing to her babies. She was so brave."

The couple had separated in November and were in the midst of a custody battle surrounding their kids.

Hannah's family are now planning to launch a charity in her name to help other victims of domestic violence.

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