9news.com.au | Teen who murdered her grandfather later comforted his grieving family 9news.com.au Adelaide grandfather Robert Whitwell was devoted to his family, but it was one of his family members who ultimately betrayed him. Mr Whitwell's own teenage granddaughter, Brittney Dwyer, murdered him inside the Craigmore home he'd invited her into in ... Family of Adelaide grandfather seek justice after embracing his killer unknowingly Robert Whitwell was murdered by his granddaughter Brittney Dwyer: Grieving family members condemn killer as cruel ... 'My poor poppa': 'Cruel and deceitful' girl, 19, 'cried' and pretended to care after her grandfather's death - even ... |