If Mom doesn't kill the dragon, he will take away the green plane and candy from little Saba, which he, actually, doesn't have. The green plane, delicious candy, and the costume of Spider-Man - do not exist in reality, even the dragon lives in the kid's imagination. But he can be blamed for all the troubles. There is no bread - it’s because the dragon took it away, the only shoes got torn - the evil dragon, probably, chewed them when they slept. A chair got broken - that terrible dragon broke the only chair. What else to do? How to explain to five-year-old Saba and four-year-old David that they have nothing, while other children have? Will they understand? So, you have to think up an evil dragon.