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Most of the children said that the bullying started when they were 8 years old.

Being regularly bullied by a sibling could put children at risk of depression later in life, according to a study led by the University of Oxford in the UK.

Researchers from the Universities of Oxford, Warwick and Bristol and University College London sent questionnaires to thousands of families with children under the age of 12 between 2003 and 2004. Six years later they contacted them again to assess their mental health.

If the children have siblings, they were asked if they were bullied by them. Specifically, the questionnaire stated: «This means that when a brother or sister tries to anger you by saying nasty and hurtful things, or completely ignores you from their group of friends, hits, kicks, pushes, tells lies about, or makes up false rumors about you».

Previous research has suggested that victims of peer bullying may be more susceptible to depression, anxiety, and self-harm.