Mother accused of stabbing 5 year-old son to death and leaving two siblings critical on family picnic

A car found at the scene of the stabbing at Valley Heights, Blue Mountains - (ABC)

A mother is accused of killing her five year-old son and leaving his two siblings fighting for their lives, after reportedly telling her husband they were going on a picnic.

The 42-year-old woman drove her car to the Valley Heights in Australia’s Blue Mountains where she parked up in a quiet street in a remote area where the incident took place, according to North South Wales police.