The cubs are now a year and a half old and learning to be kings and queens of the jungle. Play is becoming increasingly aggressive as they edge towards independence. But the biggest challenge is learning to hunt for themselves - and their mother soon loses patience with her overgrown family and their hapless attempts at hunting.
One cub turns underwater cameraman when he discovers log-cam on the edge of a lake. Another tries tightrope walking across a flimsy branch. They're even starting to consider the elephants as possible playmates - especially as an elephant's tail to a tiger is like a piece of string to a kitten. There's a new arrival among the camera elephants and many new animal stars make their appearance - including an irresistible jackal family that has to cope when the tiger family invades their backyard, and a flock of peacocks that tease the tigers by playing a game of dare.
As the family of four mature into independent hunters their hidden power is revealed. Discovered by the elephant crew when they were just 10 days old, these cubs are now reaching the end of an incredible journey.
As David Attenborough says, this is "the most extraordinary portrait of tigers yet seen".