The blue chart belongs to yy while the red chart is for charlie. Let see how they can go from here.
After 2 weeks of observation :
whenever yy is rewarded with point or as and when our girl wants some point, she will take out her point chart and tell us "I want point". I will always ask her in return "but u have to do something good to get the point". My girl will then reply saying "I am good". When I insist not giving her, she will cry and cry. After a few failure attempts, instead of asking, she went ahead to get the stamp herself and we have to snatch it back from her.