The empire separated between its western and eastern segments. The Eastern Empire kept going longer politically.
Constantine tried to bind together the realm under the Christian confidence understanding and requiring the Nicea Council to meet close to Constantinople in 325 AD. Additionally, Constantine's move of the cash-flow to New Rome left the Bishop of Rome as the most grounded authority figure in Rome itself, which empowered the improvement of the intensity of the papacy.
The definition of family has been influenced by societal norms and values. Norms of various societies differ with some societies defining family from the extended family point of view and other from the nuclear family point of view. This depends on whether a society is collectivist or individualistic