Research led by Dr. Lucy Bowes has shown that sibling bullying is linked to an increased incidence of psychiatric problems in later life, including depression. Using data from the "Children of the 90s" Study (ALPSAC), the researchers found that children who had been bullied by a sibling were twice as likely to have depression and to have recently self-harmed as young adults. The work, published in the journal Pediatrics, is the first longitudinal study to have tested the association between sibling bullying and psychiatric outcomes. The work has been reported on the BBC, NHS news, and in the national press. More detail is available here.