Merci thought that Papi would get angry and Roli thought that Papi would keep calm at the soccer team.
Step-by-step explanation:
Merci thought that their Papi would lose temper and become very angry and shout at the soccer team when they had damaged and messed up the painting they had made on the wall. Merci was used to this behavior of Papi of getting angry.
On the other hand, Roli was the one who thought that their Papi was some one who would keep calm even in the midst of the anger. Roli knew that Papi would not get angry at the soccer team.