A 16-year-old boy who allegedly called police to report the deaths of his mother and sister will front court, charged with their stabbing murders.

A 16-year-old boy will face a Queensland court, charged with stabbing what are believed to be his mother and sister to death.

The 12-year-old girl had been due to start Year 7 this week and counsellors are being sent to her school at Toowoomba, west of Brisbane.

The boy has been charged with two counts of murder and is due to face a Toowoomba court on Wednesday morning. He’ll be dealt with under the Juvenile Justice Act.

The boy allegedly called police himself to report the crime.

When officers arrived, they were confronted with a horrific scene.

Residents in suburban Newtown, where the murders were discovered on Tuesday, say it’s a terrible shock.

“They were nice, very quiet. You know, the most they’d say is ‘Hello, how are you?'” local woman Wendy Ellis has told the ABC.

“Lovely little kid, quiet, pleasant little girl, it’s just dreadful. It’s just unbelievable.”