A MUM is due to appear in court today charged with killing two of her children in a horror motorway smash.

       Mary McCann, 35, was travelling in a Vauxhall Astra with son Smaller, 10, and four-year-old daughter Lilly when they collided with a lorry.

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       Mary McCann has been charged with causing death by dangerous driving 6

       Her two children were killed in the fatal crash on the M1

       McCann is due to appear at Aylesbury Crown Court today charged with two counts of causing death by dangerous driving.

       The family were in their way back from a party for Smaller's birthday on August 9 when the horror unfolded on the M1 near Milton Keynes.

       A third child was taken to hospital but McCann's other daughter, 13, was not travelling with the family at the time.

       The driver of the Scania HGV was unhurt, but the crash caused travel chaos as the motorway was closed for 12 hours.

       Tributes flooded in for the youngsters following their deaths.

       One heartbroken neighbour told The Sun: “She’ll struggle to cope without her kids. They were her world. She lived for them.

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       “It’s the worst thing ever to happen. We can’t believe they’ve gone.

       “We don't know what happened but it’s shocked everyone. It’s horrible. We can’t stop crying. She was a good mum, she’ll never get over it."

       Another relative said: "RIP you two beautiful little angels. Never seen sadder in my life.

       "Such a cruel world we all live in. Keep their mummy and daddy in your prayers, couldn’t imagine their pain. Two little lives taken way too soon. A little brother and sister gone to heaven together."

       One loved one wrote: "Love you always and forever and never in this lifetime will you ever be forgotten, always loved."

       Another relative wrote: "RIP cousins. May God give you the best beds."

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       McCann is due in court today 6

       Her 10-year-old son Smaller and four-year-old daughter Lilly were killed in the crash Credit: Facebook 6

       McCann was arrested after being treated for shock 6

       The family were returning home to Derby after celebrating Smaller’s birthday