“…Posttraumatic stress is a mental health response to a terrifying experience, and symptoms may include intrusive thoughts, nightmares, avoidance, negative changes in temperament, ongoing distress, irritability, trouble concentrating, and self-destructive behavior (Kazak et al, 2004). A substantial number of siblings experience PTSS (Alderfer et al, 2010(Alderfer et al, , 2020Gerhardt et al, 2015;Hancock, 2011;Kaplan et al, 2013;Long et al, 2018;Tasker & Stonebridge, 2016;Yu & Bang, 2015). In one study examining family functioning and sibling distress, 62% (n = 209) of siblings reported moderate to severe PTSS, warranting a need for support services (Long et al, 2013).…”