A jealous alcoholic, from Manchester, threatened to burn his girlfriend alive - hours before a blaze that killed three generations of the same family, a jury heard today.
Kim Buckley, 46, her daughter Kayleigh, 17, and granddaughter Kimberley, six months, screamed for help as frantic neighbours looked on helplessly.
Relatives of the family of three left court in tears today as they heard heart wrenching details of the violent deaths.
Triple murder accused Carl Mills, 29, sat emotionless looking at the floor at the start of his trial at Newport Crown Court, south Wales.
Friends of the family killed in the blaze stormed out, as they heard Mills described as a "cold, calculated killer".
Gregory Bull QC, prosecuting, said on September 17 last year a drunk and jealous Mills was convinced his girlfriend was having an affair.
He bombarded her at home in Cwmbran with threatening text messages demanding she come out with a fictitious boyfriend, the court heard.
But when the fearful teenager, described as "infatuated with Mills", declined he warned: "To be honest I don't care. I will burn your house down", the jury was told.
Mills had met the teenager through the internet when he was living in Manchester and had moved to Cwmbran to be with her.
He was described as having a "magnetic control" over the teenager who turned her back on school and friends and had an increasingly bad relationship with her mother.
"It is the crown's case they he (Mills) deliberately set out to groom her sexually," Mr Bull said.
Later she became pregnant with Mills's twin girls and gave birth prematurely, Angel being still born and Kimberley born deaf, blind and with a series of health problems.
On the day of the blaze baby Kimberley had been allowed home from hospital for the first time.
Friends had decorated the family's three bedroomed home with bunting but Mills, despite being the father, was considered too violent to attend, the court heard.
A care package put together at the hospital only allowed him visitation rights while under supervision, jurors were told.