TWO children found dead in their rural home were allegedly drugged before being smothered, an autopsy has revealed.

Aussie brothers Max, six, and Sam Johnson, seven, were tragically found dead on May 5 - with their grandma arrested at the scene.

A post-mortem examination found traces of prescription drugs in the boys’ systems, according to Australian outlet The Daily Telegraph .

Police allege that the children's grandma, 66-year-old Kathleen Heggs, gave them medication before suffocating them with a pillow.

Heggs allegedly sent a text to authorities saying the two boys were dead and that she planned to take her own life.

When cops arrived at the scene, they found the boys dead in separate rooms and Heggs with self-inflicted injuries.

The siblings were reportedly sleeping when the a

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