Answer: Imagination Inflation
Step-by-step explanation:
Imagination inflation is the term that is defined as in which imagination about any event or situation occurrence that actually never happened to occur can lead to confidence increment . It is related with the concept of false memory.
According to the situation mentioned in question,Nadine is using the concept of imagination inflation to make her brother imagine about a event that never actually happened. She is repeating the story so that her brother can actually indulge in imagining about the event.