Five-year-old Chantelle Keywood and her 22-month-old sister Yleina died when the Peugeot 106 they were travelling in collided with another car on the B6042 Crags Road, near Creswell, last Monday.
Their mother and seven-year-old sister escaped with minor injuries.
Chesterfield Coroners Court will open its inquests into the sisters’ deaths today at 2.30pm.
Derbyshire Police are continuing their investigation into the cause of the crash. Witnesses should call the witness appeal line on 01773 572929 and leave a message.
• Check back here later for further updates.