Nicholas Prosper, from Luton, pleaded guilty to the murder of his mother, Juliana Falcon, 48, and his siblings, Kyle Prosper, 16, and 13-year-old Giselle Prosper at Luton Crown Court in February.
In sentencing, the judge said the words “heartless and brutal” were insufficient to describe the horror of the last moments suffered by his victims.
Their bodies were found at their flat in the town in September last year.
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