It turns out, even if your relationship with your sibling was contentious, that relationship might have protected you from some even worse effects. Guess that means we were actually helping our siblings by hogging the PlayStation all those years.
Early Stress Makes Child’s Brains Grow Up Too Fast, A sign to worry of
Early life stress might prematurely set the process of brain maturation into motion to help ensure survival. But while a rapidly matured brain might have kept humans alive in leaner times, it may also have hampered brain plasticity — the brain’s ability to adapt.