The authors of the amicus brief write (page 36):
“The amici in support of DOMA and Proposition 8 cite studies purporting to show the superiority of biological parents over adoptive parents, see Brief for Social Science Professors at 14 n.6 (citing Brent Miller et al., Comparisons of Adopted and Non-Adopted Adolescents in a Large, Nationally Representative Sample, 71 Child Development 1458 (2000)), and a publication by an advocacy organization purporting to show problems for children conceived by donor sperm, see Brief for Coalition for the Protection of Marriage as Amicus Curiae Supporting Petitioner–Hollingsworth at 23, No. 12-144, and Respondent–BLAG, No. 12-307 (U.S. Jan. 29, 2013) (citing Institute for American Values (Elizabeth Marquardt, Norval D. Glenn, & Karen Clark, co-investigators), My Daddy’s Name is Donor: A New Study of Young Adults Conceived Through Sperm Donation (2010)). As with the rest of their studies, these studies do not examine same-sex parents or their children. It is hard to see the relevance of these citations to the issue of marriage rights for same-sex couples given that both adoption and assisted reproduction are widely used by heterosexual couples, as reflected in the very sources cited in support of DOMA and Proposition 8.” [hyperlink and italics added]
While our study “My Daddy’s Name is Donor” does not have clear implications one way or another regarding same-sex marriage, it is not true that the study does “not examine same-sex parents or their children.” The My Daddy’s Name is Donor study does reveal how persons conceived via sperm donation to lesbian couples are both similar to and different than others conceived via sperm donation. While those conceived via sperm donation to lesbian couples reported faring a little better overall compared to their peers conceived via sperm donation to heterosexual parents or single mothers, they were nevertheless similar to most donor conceived persons in faring worse overall compared to those raised by their biological or adoptive parents. On average, the loss of their father in their daily lives seems to matter to children, no matter whether it happens via sperm donation or another course such as divorce, relinquishment, or abandonment.