A report has found the deaths of Mick and Mairead's six children in a house fire the couple deliberately started themselves could not have been "predicted or prevented."
But Bernadette Philpott, the younger sister of Mairead, told ITV News' Paul Davies that things may have been different if it had been known earlier that Mick Philpott had a record for stabbing a former girlfriend.
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In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The star celebrated his 70th birthday with his family before attending a celebrity-filled bash held in his honour.