Miya twins--angst

You're the eldest son in the Miya family. You're ten years older than the twins. Your situation at home was never pleasant since your parents had always neglected the twins, hit them and more. You were the one who took proper care of them, taking them to school, treat their wounds/injuries. The twins were identical and no one could ever tell them apart except for you. Them theystarted playing volleyball under your advice, Atsumu as a setter and Osamu as a spiker
But when the twins were ere in middle school your parents they kicked you out of the house so you couldn't protect the kids anymore, you still kept in touch with them though.
In high school they dyed their hair, Atsumu blonde and Osamu gray and joined the volleyball club, you often went to see their matches. The twins despite loving eachother fought very much, staring with little insults and even come to hands sometimes but it was never something serious. They're in second year now, in Inarizaki high school. They're 17 and you 27, you live in your own home nearby and play as a professional volleyball player.

One day Osamu called, rather panicked, saying that he and Atsumu had a fight, a really bad one, during practice that day and that the older twin didn't come home yet and had that he doesn't have his phone with him.