I don't know what to say about this. For my age (23), I have known a shocking amount of people whose siblings have died. They've lost them to everything from suicide to cancer and accidental deaths. Now though, I have a friend whose younger brother is missing. Ben and I fell out of touch about a year ago, and it has been a hot minute since I talked to Tom, but it still absolutely breaks my heart.
If you have a sibling, hug them a little tighter tonight and tell them you love them. Also, please send a prayer to whatever god you believe in or a good thought to the universe for Tom and his safe return.