A grandmother and a four-year-old boy have been found stabbed to death in their home , while the grandfather was bound and gagged nearby , . The Vietnamese couple were babysitting their four-year-old grandson when the grandmother and young boy were killed at their Melbourne home , police believe . Police also found the 61-year-old grandfather bound and gagged on the lounge room floor of the Albanvale home on Tuesday afternoon . A grandmother and her four-year-old grandson were found stabbed to death in Albanvale , Melbourne . The grandmother was found dead in the backyard and the boy was found in a bedroom . A 45-year-old Chinese woman , from Albion , has been arrested and is being questioned . Detective Senior Sergeant Stuart Bailey said police were called to the grandparents ' address about 5.10pm , after reports a woman had been assaulted . The scene that greeted them was 'horrific ' . The grandfather was also found bound and gagged in the living room . A Chinese woman had arrived at the home earlier in the morning , and an altercation occurred when the 61-year-old grandmother returned home in the afternoon . 'It 's an extremely distressing situation for police , ' he told reporters on Tuesday night . He said the Chinese woman had arrived at the home earlier in the morning , and an altercation occurred when the 61-year-old grandmother returned home in the afternoon . 'Whereby , she 's been fatally stabbed in the backyard , ' Det Sen Sgt Bailey said . Police say a Chinese women is being questions after an altercation took place before the stabbing . The grandparents look after their four-year-old grandson every Tuesday while his parents work . Det Sen Sgt Bailey said the boy 's parents , from Maidstone , were obviously inconsolable and devastated . Homicide detectives will remain at the scene throughout the night , while several witnesses are assisting police at a nearby station .
A grandmother and a four - year - old boy have been brutally stabbed to death . The grandfather was found bound and strangled in the living room . The grandfather was found in the backyard and the boy in a bedroom . A 45-year - old Chinese woman has been stabbed . The woman had arrived at the scene earlier and an alteration occurred .