See the Heritage Foundation, "New Research on Children of Same-Sex Parents Suggests Differences Matter":
Two peer-reviewed articles published Sunday in a scholarly journal cast doubt on a core assumption used to advance same-sex marriage.Continue reading.
A number of studies and articles have suggested that research shows no difference in outcomes between children whose parents have same-sex relationships and their peers raised by heterosexual parents. For example, the American Psychological Association (APA) stated in 2005 that “Not a single study has found children of lesbian or gay parents to be disadvantaged in any significant respect relative to children of heterosexual parents.”
Yesterday the academic journal Social Science Research published a detailed methodological review of the research on which the APA bases its conclusion—a study that questions the validity of the “no difference” assertion. Conducted by a Louisiana State University family scholar, the article concludes:
[N]ot one of the 59 studies referenced in the 2005 APA Brief compares a large, random, representative sample of lesbian or gay parents and their children with a large, random, representative sample of married parents and their children. The available data, which are drawn primarily from small convenience samples, are insufficient to support a strong generalizable claim either way. Such a statement would not be grounded in science. To make a generalizable claim, representative, large-sample studies are needed—many of them.