Mother is accused of killing her two sons after they were found dead in their Blue Mountains home. Suspected murder and attempted suicide.

A mother is accused of killing her two sons after they were found dead in an alleged murder-suicide attempt.

The two boys, aged nine and eleven, were found with stab wounds in a house on Chapman Parade in Faulconbridge in Sydney's Blue Mountains shortly before 12.40pm on Tuesday.

Her 42-year-old mother was flown by helicopter to Westmead Hospital in Sydney after apparently inflicting self-inflicted injuries to her wrists.

On Friday evening, she was charged with double murder (domestic violence).

Photos posted on social media in recent months show the family beaming with joy as they posed for photos with Santa, enjoyed the family holiday and explored the wilderness around the Blue Mountains.

Just eight months ago, Google Streetview images showed the children's Christmas decorations hanging in the front yard of the family's home.

Retired homicide detective Steve Ticehurst, who lives just around the corner from the family, said they were well-loved members of the close-knit community.

The family is depicted in happier times

A major police operation was carried out in Faulconbridge after the bodies of two young boys were found in a house on Chapman Parade.

The boys' mother was taken to Westmead Hospital in Sydney with knife injuries

“They seemed like a really happy family. They've lived here for years and you would never expect something like this to happen,” he told Daily Mail Australia.

“They all came together for the Christmas party on the local street and seemed like the perfect family.”

“The mother used to be known for taking afternoon walks around the neighborhood to get some exercise, and we would always chat.

“There was never any indication that anything was wrong. I couldn't say a bad word about her.”

Another neighbor, who wished to remain anonymous, said the entire community was shaken by the incident.

The boy’s father (pictured with his family) found the bodies of his sons and his former partner

The mother's mental state will be part of the police investigation

The bodies of two boys, aged 9 and 11, were discovered in the house in Faulconbridge (pictured: paramedics at the scene in western Sydney).

The scene of the incident is just 450 metres from the famous Norman Lindsay Gallery in the Blue Mountains.

Local residents said they had not seen the father “for a while,” but he had once attended local events with the children and mother.

“You used to see them all the time walking their dogs on the street and out and about with their sons,” said the resident.

“They were lovely young boys.

“You would never think something like this could happen here – it’s a quiet community.”

The children's father, who is separated from the mother and does not live at the same address, called 911 when he visited the house and found the bodies of the boys and his injured former partner.

Shocked neighbors described the woman and her sons (pictured) as a truly happy family

The boys, aged nine and eleven (both pictured), were found dead in the house on Tuesday

New South Wales Police said officers from the Blue Mountains Police Area Command are investigating the circumstances of the deaths, assisted by detectives from the State Crime Command's Homicide Squad.

The 42-year-old mother of the two children was flown by helicopter to Westmead Hospital in a stable condition.

Emergency services were called to the property on Chapman Parade at around 12.40pm on Tuesday.

Neighbor Barbara Faith said she regularly saw the two brothers riding their bikes home from school.

“They were wearing their helmets and doing the right thing… I just thought they were nice kids,” Ms Faith told ABC.

She said there was a huge commotion shortly after noon when about 20 emergency vehicles raced down her street.

“It’s such a quiet neighborhood and quiet street that you don’t expect something like this,” she said.

“It's just so sad. I can't believe something like this can happen anywhere, let alone on my street.”

For free mental health support call Lifeline Australia: 13 11 14