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It is important to recognise that it is perfectly normal for parents to argue or disagree with each other. However, when parents engage in conflicts with each other that are frequent, intense and not resolved, children do less well. Where they become withdrawn, or express low levels of warmth for each other, children’s emotional, behavioural and social development is also put at risk. Where parents successfully resolve arguments, children can learn important positive lessons which can help them navigate their own emotions and relationships beyond the family circle.  

http://www.bbc.com/news/education-43486641