The number of Americans who have children and live together without marrying as increased twelvefold since 1970, according to a report that was recently released by the University of Virginia. This new generation of children is more likely to have unmarried parents than divorced parents.

The report was published by the National Marriage Project, and the Institute for American Values, two partisan groups that advocate for strengthening the institution of marriage.

The report cites data from the Census Bureau as well as the Centers for Disease Control and Prevention, and includes work from 18 researches who study family issues.

According to the National Survey of Family Growth, part of the Centers for Disease Control, 42 percent of children have lived with co-habitating parents by age 12, far more than the 24 percent whose parents have divorced.

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