But why, though?

Little boy and his grandmother, on the train.
Where we going?
We're going to see mommy and auntie Jinny.
But why, though?
We're going to get out here at the next stop.
But WHY, though?
Because mommy is at Auntie Jinny's, and we're going to see them now.
But WHY, THOUGH? Huh?
Silence.
Huh? HUH?