Devastated locals reveal what they fear triggered a grandmother to allegedly murder her two young grandsons, aged 6 and 7, in Coonabarabran house of horror - as cops wait to charge her

There were no signs anything was amiss with 66-year-old Kathleen Heggs or the boys, six-year-old Sam and seven-year-old Max, according to Coonabarabran locals who knew the family.