[ ...They can't help but smile at being called a good child because ugggggghh how they've wanted to hear that from anybody for so long. The hammering slows a little, though, in trying to figure out how to explain their dad. ]

Mm... It was just me and dad for a couple years, but one day he never came home. I don't know what happened to him. Maybe he's dead, maybe he didn't want me anymore. I don't know.

[ Dead, hopefully, as hurtful as it is to wish such a thing upon one's parent. But he'd just never came home, just like how Aniki never came home, except this time there was nobody to return home and bring the news back. ]