Britain: A cab driver allegedly clubbed his wife and three children to death with a bat because he thought she was having an affair
Rahan Arshad, 36, then fled to Thailand - leaving their bodies undiscovered at the family home in Turves Road, Cheadle Hulme, Manchester, for almost a month.
Paul Reid QC, prosecuting, told the jury the evidence they would hear would be distressing.
Mr Arshad denies four counts of murder at Manchester Crown Court.
The jury heard when Mr Arshad was arrested, he confessed to the murder, adding: "My beautiful kids. I don't regret killing that bitch, but my kids, killing my kids..."
The court was told Arshad killed his wife Uzma Rahan, 32, sons Adam, 11, and Abbas, eight, and daughter Henna, six, last July.
His wife's body was found in the main bedroom upstairs and the children were found in the lounge.
Mr Reid told the jury the couple had an arranged marriage in 1992 but their relationship hit the rocks from before Easter 2003 because Arshad believed his wife was having an affair.
Mr Reid said: "Despite Uzma's denials to many about the affair, including her family and friends, the affair was an open secret and lasted until about April 2006."
Man 'used bat to kill family'