Derby fire deaths: 'Possible' that Mick Philpott set fire 19 March 2013 Last updated at 13:20 A mother accused of the manslaughter of her six children in a house fire has told jurors it is "possible" her husband started the blaze. Mairead Philpott said her husband Mick could have got up in the night and set the fire without her knowledge. Richard Latham QC, prosecuting, asked if she thought her husband could have set the fire and she replied: "I don't know." Mr and Mrs Philpott and friend Paul Mosley deny six counts of manslaughter. Mrs Philpott told Nottingham Crown Court she had been asleep in the conservatory with her husband on the night of the fire. She said during cross-examination: "I don't know if he's done it, I don't know who's done it, I was asleep." Mr Latham asked: "Are you saying there is a possibility your husband set this fire behind your back?" "I honestly don't know," she replied. Mrs Philpott was asked about covert recordings in which her husband talked of "sticking to the story" and asked if she wanted him to "blab." She said they were talking about details of their sex life - which included dogging and threesomes - which they did not want to become public. Suicide attempt Mr Latham said this explanation did not make sense. "This is not about the sex, it's about the allegation of killing your children," he said. Earlier, Mrs Philpott said she took an overdose because she wanted her husband, his mistress Lisa Willis and all of the 11 children to be back together. Miss Willis and her five children left the home in Derby that they shared with Mr and Mrs Philpott and their children three months before the fire on 11 May. Talking about Miss Willis, Mrs Philpott said: "She has always wanted Mick for herself." Mrs Philpott's son from a previous relationship, 13-year-old Duwayne, died later in hospital.