Summary of Key Points
In recent years, whether one is an only child has become an invisible barrier in the matchmaking market: many people prefer to marry others who are also only children (the so-called "double-only" marriages are common), and there exists a hierarchy of disdain within non-only-child families. This preference is driven by practical considerations such as resource distribution, elderly care responsibilities, and social interactions. Only children have a greater advantage in seeking partners with better qualifications (what is known as "upward marriage"). However, as the new generation born under the two-child and three-child policies enters the dating scene, this preference for only children may gradually diminish.
I. Checking for "Only Child Status" Before Matching: Regional and Group Differences in Double-Only Marriages
The idea of "only children marrying only children" is not just a random online debate; it is a reality supported by data:
- Regional Differences: Areas with strict family planning policies (Beijing, Shanghai, Tianjin, Chongqing, and the three northeastern provinces) have the highest proportion of double-only families. For example, in Shanghai, the probability of a double-only marriage is 4.43 times higher than chance; in ethnic minority regions like Yunnan and Guizhou, where policies are more relaxed and there are fewer only children, the probability of a double-only marriage is 0.94 times lower than chance.
- Urban vs. Rural & Gender Consensus: Urban residents have a stronger preference for only children. Both men and women agree with this, with the proportion of only children marrying only children being 35.9% higher than non-only children marrying only children. The reverse is also true by 35.7%.
- Trend Continuation: Even after controlling for factors such as household registration, data from 2010 shows that the probability of only children marrying only children was still 18.4% higher than that of non-only children.
II. The Hierarchy of Disdain within Non-Only Child Families: Which Combinations Are Most Risky?
Within non-only child families, there are preferred and less desirable combinations, roughly ranked as follows:
Sisters (younger sister > older sister) > Brothers (younger brother > older brother) > Sisters-in-law (younger brother > older sister) > Brothers-in-law (younger brother > older brother)
- Most Popular: The sister combination is favored because it eliminates potential burdens such as dowry and housing subsidies.
- Least Desirable:
- Brother-in-law combinations: For women, this means facing conflicts with in-laws and possible favoritism; for men, it could lead to problematic relationships with relatives.
- Sister-in-law combinations: Women may face a brother-in-law who interferes in their lives, while men may deal with an overly involved sister-in-law.
III. The Underlying Concerns: The Complex Issues of Money and Resources
The focus on whether someone is an only child stems from fears of being at a disadvantage:
- Resource Distribution: Only children can inherit their parents' house, savings, and pension; non-only children have to share resources, which may even result in them contributing financially to their siblings.
- Elderly Care Responsibilities: Non-only child families often struggle with who will take care of the elderly, while only children are concerned about supporting their spouses in this regard.
- Social Interactions: Non-only child families have more relatives (in-laws, etc.), making it difficult to manage social etiquette and avoid conflicts.
- Dowry Data: A survey in Baoding, Hebei, found that double-only families offer the lowest amount of dowry but the highest average amount ($82,000, with a maximum of $660,000), as both sets of parents consider the property to belong to the children, effectively merging the family assets rather than one party compensating the other.
IV. The Advantages of Only Children in "Upward Marriage"
Only children have a higher chance of success in seeking partners with better qualifications:
- Data Support: A 2000 census showed that 20.5% of only children married someone from a higher social class, compared to 18.1% of non-only children. In 2010, data indicated that double-only couples had an annual income four times higher than non-only couples and were more likely to receive financial support from their families, as well as owning more valuable homes.
- Income Differences: Higher-income only children tend to form strong partnerships with others from similar backgrounds, while lower-income only children use marriage as a means to improve their social status.
V. The Future: Will the Two-Child and Three-Child Policies End This Competition?
As the children born under these policies grow up, the rarity of being an only child will decrease. When they enter the dating market, the question "Do you have siblings?" may become a routine topic rather than a significant barrier, as almost everyone will be from non-only child families, eliminating most of the distinctions.
(Note: All data cited in this analysis comes from academic studies to ensure accuracy.)