[Rinka shakes her head]

My mom met him while she working in Japan for a while. I don't really know a thing about him.

[Like... does he even know he has a daughter? But this isn't about her. They're visiting Sakura's past home, not hers.]

You were close with your brother? You called him 'onii-chan.'

[which... if Rinka is remembering the unit on family members properly is an affectionate term for your older brother]