The teenager from Salignac, slipped on leaves and accidentally pulled the trigger, firing a bullet at his father in Sourribes, Alpes-de-Haute Provence, on Saturday.
The bullet struck his 42-year-old father in the legs.
The boy then called a family member who contacted emergency services but the father succumbed to the injuries after haemorrhaging and died before paramedics arrived.
The distraught adolescent then turned the gun on himself and dropped dead beside his father's body, 'The Telegraph' reported.