Tipping, 36, stabbed his dad Anthony Tipping and mum Patricia Livesey a total of more than 320 times at their Cann Bridge Street home on November 20 2021.
He claimed he acted in self defence when he knifed his father 165 times following an explosive argument over a bedroom door which he had broken – but the jury did not accept this.
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He then turned on his mother, stabbing her more than 150 times.
Upon hearing the verdict at Preston Crown Court today (June 30), gasps arose from the public gallery where family members sat.
Tipping began shouting as he was taken into custody, where he will remain until his his sentencing at the court on July 28.