Event - As a kid I couldn't stand my brother--some good reasons and some not so good. I even pushed him down the stairs once among other things. Even though the enmity died away we were never close.
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[my choice
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Apology - It's too late to tell him now {he passed away} but I do regret the loss of what could have been a much better relationship and hope he knows that I apologize and wish I had made a better effort.