Assuming the universality of that kinship, the question remains : What were the stages of development of the family system, founded on the principle of agnation, as at Rome ?

• 假设了血族关系的普遍性，留下的问题是：象在罗马那样基于男系亲属原则的家庭制度的发展阶段是什么？问题中的一些我们努力过了；