The purpose of the research is to critically review the major changes of marriages and families during the 20th & 21st centuries and its impact on family relations. Especially, three topics that is, changes in the meaning of marriage, changes in the gender role and sexuality, and changes in the life span were reviewed in terms of how those changes had impacts on each family members and who had been influenced most. Also, how those kinds of changes will have influences on marriage and family relations. Finally, based on the review implications and research agendas for the family scholars were added.