A woman who crashed into a car later discovered she had killed her own sister, a court has heard.
Rosie-Ann Stone was not told until after the accident that the woman who died in the accident was her older sibling Jennie.
Social work student Jennie had been driving a Peugeot 206 towards Bridlington when she was in a collision with a Vauxhall Astra, driven by her younger sister Rosie-Ann, before crashing into a tree.
She had just dropped her son Charlie, then aged nine, at school.
Rosie-Ann did not know her sister Jennie was on the same stretch of road when the crash happened. Rosie-Ann had been driving back from Skipsea, East Yorkshire, where she had been helping her sister get ready to move house.
Rosie-Ann is accused of failing to look in her mirror and pulling out to overtake when it was not safe to do so but has pleaded not guilty to a charge of causing death by careless driving.
The tragedy came just months after the family had to cope with the death of their brother Gregg, who was shot by Taliban fighters while serving in Afghanistan.
Private Stone, 20, was with the 3rd Battalion The Yorkshire Regiment when he was killed as he took part in a mission to rescue an Afghan policeman in Helmand Province in June 2012.
Speaking after Jennie's death in February this year, her parents Bob and Angie said they had barely come to terms with losing their son when they were told they must also grieve for their oldest daughter.
Bob, 46, said: "If we weren't broken, we are now. We've had to explain to Charlie he'll never see her again. His eyes are raw from crying."
Rosie-Ann, of Bridlington, appeared at Bridlington Magistrates Court and was bailed to appear before a judge at Hull Crown Court on September 5.