This dissertation explores how family and marriage relationships vary according to the culture in which they occur. Based on the individualism/collectivism framework about cultural variations in familial beliefs across countries, I study three topics of family and marriage relationships across cultures. In the first study, I examine how 17 member countries of Organisation of Economic and Co-operation and Development (OECD) differ culturally in older adults' preference for family elder care. I find that older adults from countries with more traditional values that emphasize the importance of a strong parent-child tie are more likely to prefer family care rather than formal care than those from more secular-rational countries with less emphasis on the parent-child tie; the cultural difference gets smaller at a higher level of individual family income. In the second study, I select China as a representative of the collectivist culture, and look into how the collectivist culture and older parents' filial beliefs shape the intergenerational relationship in China. I find that patrilocal and patrilineal traditions are still prevail in China. A highly cohesive intergenerational relationship people idealize in the collectivist culture is more common between older parents and married sons, and least common between older parents and married daughters. In the third study, I compare an individualist society, the U.S., and China, a collectivist society to test whether marriage also isolates people from their informal social network in China as observed in the U.S. I find that marriage does not isolate but integrates people into their informal social network in China, while marriage isolate people in the U.S. The three studies present new evidence on how marriage and family experiences differ due to different cultural beliefs about family, and under what conditions the cultural influences are weakened or reinforced. / Ph. D.