Never-ending Questions

Here is a conversation from our walk to the park today:

B: when we get to the park, we all play together?
Me: well, Daddy will meet us at the park after his run, and then I'll go for my run.
B: you switch?
Me: right, I'll go for my run and you'll play with Daddy.
B: then you switch again?
Me: no, then we'll all meet up at home and be together.
B: Why?
Me: to eat supper and then go to bed.
B: Why?
Me: because it's suppertime and then bedtime.
B: Why?
Me: because it's nighttime.
B: Why?
Me: I don't know how to answer that question.
B: Maybe it's just because!