Police were called to a home on Jamieson Avenue, Baulkham Hills, at about 5.20am today.

They found a 10-year-old boy, a 13-year-old girl, a 16-year-old girl, and a 46-year-old woman, all with stab wounds.

They are all believed to be known to each other.

They were treated at the scene and taken to hospital in a stable condition.

An investigation is underway.

It’s understood police are not looking for any other person.

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