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Some relationships are within the family -- such as between parents and children, grandparents and children and between siblings -- while others are between friends. In some cases, these distinctions are blurred (Are short-term partners family members? Are family members seen as such when relations become unfriendly? Does divorce, if amicable, replace a family with a friendship?). Using quantitative, cutting-edge statistical analysis, in conjunction with a multi-disciplinary approach, the c...