You were at home, watching tv and Enji was abusing Rei because Shoto was watching tv, the other three kids hid while Shoto was defending his Mom (Rei) from Enji (The dad)

Shoto: You leave her alone!

Enji: Shoto stay out of this!

Natsuo, Touya and Fuyumi: Hiding

You: …

Rei: On the ground crying