A Perth man has been charged with killing his two young children at their home in the city's north.
The bodies of the children - a five-year-old girl and three-year-old boy - were found in the house in the coastal suburb of Yanchep on Thursday night
Police also found their 35-year-old father with severe injuries.
He was rushed to Royal Perth Hospital where he remains in a serious but stable condition under police guard.
On Saturday, police charged him with two counts of murder and say a bedside court hearing will be arranged in the near future.
Detective Inspector Peter Clements said on Friday police believed the father was responsible and his injuries were self-inflicted.
"His injuries were fairly significant requiring some fairly intense medical attention," Det Insp Clements said.
The children's mother also lived at the home but was not present when police were called.
"We have a family liaison officer appointed to her, we are in direct contact with her now, she is obviously very, very distressed," Det Insp Clements told reporters.
"We are doing what we can at this point to provide support not only to her but the police officers who attended, it was obviously quite distressing."
The children's distraught grandmother, and the man's mother, has urged anyone suffering from depression to get help.
"I thought I had a dream or something but when you face it and it is real ... it just hits you, especially with two little ones, grandchildren ... where do we go from here?" Georgina told ABC radio.
"If you are having problems, if you are feeling depressed, please God, talk to someone about it."
The street Flight Vista is in a golf course estate with many properties still under construction and residents who are new to the area.
Bunches of flowers have started to be placed in the street.
Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14 or MensLine Australia on 1300 78 99 78.
