State Fish and Wildlife Officer Cal Treser says the female cougar killed last week was about 4 years old and very skinny at about 50 pounds - half of what it should weigh.
Treser says the teens' father, Tom White, had chased the cougar away from their calves twice on Feb. 19. The next day his son went out to feed the dogs and was returning to a basement door when he spotted the cougar following him.
His daughter had a tag to hunt cougars and shot the animal.
The Wenatchee World reports it was the third cougar killed in a week in the area just outside Twisp.