Based on the context and the answer, generate a question. 

Context: The joy part of today is just seeing them both do things together . Yesterday Alex was trying to get Ethan to play with the cars like he does . Rolling them on the ground under the table at that moment .

Answer:

The speaker is the boy 's parent and wants to see their children interact peacefully



Why is seeing the two play well together the joyful part of the speaker 's day ?