Published research employing the New Family Structures Study (NFSS), the ECLS (Early Childhood Longitudinal Study), the US Census (ACS), the Canadian Census, and now the NHIS all reveal a comparable basic narrative, namely, that children who grow up with a married mother and father fare best.

A new study published in the February 2015 issue of the British Journal of Education, Society, and Behavioural Science appears to be the largest yet on the matter of same-sex households and children’s emotional outcomes. It analyzed 512 children of same-sex parents, drawn from a pool of over 207,000 respondents who participated in the (US) National Health Interview Survey (NHIS) at some point between 1997 and 2013.

Results reveal that, on eight out of twelve psychometric measures, the risk of clinical emotional problems, developmental problems, or use of mental health treatment services is nearly double among those with same-sex parents when contrasted with children of opposite-sex parents.

The estimate of serious child emotional problems in children with same-sex parents is 17 percent, compared with 7 percent among opposite-sex parents, after adjusting for age, race, gender, and parent’s education and income.

Rates of ADHD were higher as well—15.5 compared to 7.1 percent. The same is true for learning disabilities: 14.1 vs. 8 percent.

The study’s author, sociologist Paul Sullins, assessed a variety of different hypotheses about the differences, including comparative residential stability, experience of stigma or bullying, parental emotional problems (6.1 percent among same-sex parents vs. 3.4 percent among opposite-sex ones), and biological attachment.

Each of these factors predictably aggravated children’s emotional health, but only the last of these—biological parentage—accounted for nearly all of the variation in emotional problems.

While adopted children are at higher risk of emotional problems overall, being adopted did not account for the differences between children in same-sex and opposite-sex households.

It’s also worth noting that while being bullied clearly aggravates emotional health, there was no difference in self-reported experience of having been bullied between the children of same-sex and opposite-sex parents.

Vocal critics, soon to emerge, will likely home in on the explanatory mechanism—the fact that two mothers or two fathers can’t possibly both enjoy a biological connection to a child—in suggesting the results of the study reveal nothing of value about same-sex households with children. On the contrary, the study reveals a great deal. Namely, there is no equivalent replacement for the enduring gift to a child that a married biological mother and father offer. It’s no guarantee of success. It’s not always possible. But the odds of emotional struggle at least double without it. Some critics might attribute the emotional health differences to the realities of “adoption by strangers,” but the vast majority of same-sex couples in the NHIS exhibited one parent with a biological relationship with the child.

Even research on “planned” same-sex families—those created using assisted reproductive technology (ART)—reveals the significance of biological ties. Sullins notes such studies

have long recognized that the lack of conjoined biological ties creates unique difficulties and relational stresses. The birth and non-birth mother . . . are subject to competition, rivalry, and jealousy regarding conception and mothering roles that are never faced by conceiving opposite-sex couples, and which, for the children involved, can result in anxiety over their security and identity.

The population-based study pooled over 2,700 same-sex couples, defined as “those persons whose reported spouse or cohabiting partner was of the same sex as themselves.” This is a measure similar to that employed in the US Census, but it has the advantage of clarity about the sexual or romantic nature of the partnership (being sure to exclude those who are simply same-sex roommates). Among these, 582 had children under 18 in the household. A battery of questions was completed by 512 of them.

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