They looked peaceful, they were in their beds

The grieving father whose four children, estranged wife and mother-in-law were all shot dead inside their rural home in a suspected mass murder-suicide has spoken out for the first time since the tragedy.

Aaron Cockman said his four autistic children — Taye, 13, Rylan, 12, Arye, 10, and Kadyn, 8 – looked ‘peaceful in their beds’ after they were allegedly shot by their grandfather Peter Miles.

In an emotional address to media outside the Margaret River police station Sunday, Mr Cockman chillingly claimed Peter Miles had made a calculated decision to murder three generations of his family before committing suicide.

‘Peter didn’t snap. He’s thought this through. I think he’s been thinking this through for a long time,’ he said.

‘All these kids died peacefully in their beds. The (police officer) that went through, he said they looked all peaceful.

‘How the hell Peter did that I still can’t figure out, but if someone did it … he did a good job, he did a really good job.’

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Grieving father Aaron Cockman, whose four children, estranged wife and mother-in-law were shot dead inside their rural home, has broken his silence about the tragedy

Grieving father Aaron Cockman, whose four children, estranged wife and mother-in-law were shot dead inside their rural home, has broken his silence about the tragedy

Peter Miles (second from left in suit and blue tie) is reportedly suspected of shooting dead his wife, Cynda, (back right), his daughter Katrina Miles (left in red dress) and her four autistic children aged from 8 to 13 (pictured) before shooting himself

Peter Miles (second from left in suit and blue tie) is reportedly suspected of shooting dead his wife, Cynda, (back right), his daughter Katrina Miles (left in red dress) and her four autistic children aged from 8 to 13 (pictured) before shooting himself

'Peter didn't snap. He's thought this through. I think he's been thinking this through for a long time,' Mr Cockman claimed

‘Peter didn’t snap. He’s thought this through. I think he’s been thinking this through for a long time,’ Mr Cockman claimed

Father whose four children were shot dead breaks his silence

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A stunned Mr Cockman spoke candidly about his ongoing custody battle with his estranged wife, revealing he had been cut off from his children six months ago and was desperately fighting to get them back before the massacre.

‘I used to drive around town just hoping to see them – but that anger I felt is gone,’ he said.

‘If it wasn’t for Kate’s parents and the whole turn around, I’d still be with her and the kids.’

He said he was frustrated with his estranged wife’s family after being denied the right to see his children, ‘but this is not how I’d want to get back at them’.

‘This is a whole new level. The anger towards them now is completely gone, completely gone.’