Man charged over alleged hit-and-run crash that killed siblings in Sydney

20-year-old to face court over head-on collision that killed 24-year-old woman and her 15-year-old brother

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A 20 year-old New South Wales man is due to face court on Sunday charged over a horror crash in Sydney's south-west that killed a young woman and her teenage brother.

Emergency services were called to the incident about 9.30pm on Friday to find the pair trapped inside their Toyota Echo after it was hit head-on by a Mercedes allegedly travelling at high speed on the wrong side of the road.