PICTURED: The grandfather suspected of shooting dead his wife, their daughter and her four autistic children in horror murder-suicide - as police say his former son-in-law was not involved Grandfather Peter Miles is suspected of murdering his wife, their daughter and her four autistic children They were all found dead at the family farm in Osmington, 15km from Western Australia's Margaret River It is believed Peter Miles, called police at 5am (local time) before turning the gun on himself Children's father Aaron Cockman, is not being investigated by police despite marriage breakup with his wifePolice reportedly suspect a grandfather of...