A man who admitted using knives to murder his wife, three young children and mother-in-law has become the first person in Western Australia ordered by a judge to never be released from prison.

Anthony Robert Harvey, 25, killed two-year-old twins Alice and Beatrix, three-year-old Charlotte and their mother Mara Lee Harvey, 41, at their Bedford home on September 3, 2018.

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Grandmother Beverley Ann Quinn, 73, was murdered when she visited the next morning, the WA Supreme Court heard on Friday.
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