The Sun reported that his wife and the children's mother, Sally Stokes, was held hostage but managed to escape with serious stab injuries.
Speaking at an inquest at Loughborough Coroner's Court, Sally revealed she found out that David had a second mobile phone and confronted him about it.
She said he smashed up their kitchen before stabbing her, adding that he had been cheating on her by regularly using dating sites to go out with other women.
The Mirror reported that the hearing was also told that David had previously won £40,000 (about R762,000) in the lottery and spent the winnings on shares, a new car and prostitutes.
Chemicals and various knives were found in the house.