Growing up with a large number of siblings makes people more likely to marry and cuts the odds of divorce, according to new research.
 
The study suggests that those from bigger families learn how to cope better with conflict and to control their emotions and that the experience of never having the house to oneself may foster a distaste for being alone.
 
Whatever the explanation, when it comes to preventing divorce in adulthood, “the more siblings the better,” concluded a group of sociologists from Ohio State University, who presented their research on Tuesday at the American Sociological Association.
 
In a sample of 57,000 American adults surveyed at 28 points between 1972 and 2012, the researchers found that just four percent had grown up without any siblings. Of the 80pc who had married at some point during the period studied, 36pc had been through a divorce, the Los Angeles Times reports.
 
Among those who had married, each additional sibling a person had was associated with a two percent decline in his or her odds of having divorced. Only-children were not only less likely to marry than those with siblings; they were more likely to have divorced.
 
The study’s findings provide “one of the few pieces of evidence that siblings provide value,” acknowledged the researchers, Donna Bobbitt-Zeher, Douglas B. Downey and Joseph Merry. Research on the impact of siblings has largely found that only-children and those in smaller families fare better economically and in school.
 
But with plummeting family sizes and an explosion of single-child families in industrialised democracies, researchers have begun focusing on the less tangible benefits of sharing a household with brothers and sisters.
 
Studies in the past decade have found substantial psychological differences between only-children and those with any siblings.
 
But the Ohio State team found a subtler, more unexpected pattern in which “more is better”. In a subsequent analysis of their findings, the group noted that at around seven siblings, the divorce-prevention benefits of having additional siblings leveled off.
 
While the trend toward smaller families is well established in the United States, it is even stronger in several European countries, where families with a single child have become quite common.
 
If supported by further research, the finding that such children may be less likely to marry and, if they do, more likely to divorce could result in significant demographic shifts, here and elsewhere, say the researchers.