Elizabeth Edwards and her 13-year-old daughter were stabbed as they slept at home.
A 15-year-old girl has been found guilty of murdering a mother and daughter in Spalding in Lincolnshire.
Elizabeth Edwards, who was 49 years old, and her 13-year-old daughter Katie were stabbed in the neck as they slept at home in April.
A 15-year-old boy had previously admitted to killing both women.
The prosecution had alleged during the trial that although the girl did not physically take part in the killings, she was “as guilty of murder” as he was.
The teenager, who was 14 years old at the time, cannot be named.
Both the guilty parties will be sentenced at a later date.