You think you know someone. It could be a sibling you’ve known since birth—yours or theirs—or the BFF would-be sibling you never had or anybody else. Take your pick; it really doesn’t matter. Then think again.
Remember that a lost soul, deep down, retains the essence you thought you knew. So either love the person back from the ledge or protect yourself in a deadly clinch. Neither way comes easy.
Know that cautionary tales spring from life. Listen. Learn.