2/6. Mum Tanja and stepdad Paul express their devotion to Jessica, 9, and Ryan, 11, through indulging their every whim. But the future looks grim as the parents see how the children could look when they're 40. Cue Kris Murrin and his three-week lifestyle overhaul. But how will a ban on sweets and a huge reduction in time in front of the TV go down? New.