Mark Regenerus from the University of Texas at Austin, has recently published a study on same-sex relationship and their children. Based on The New Family Structures Study (NFSS), which is a social-science data-collection project that fielded a survey to a large, random sample of American young adults (ages 18–39) who were raised in different types of family arrangements.
The study findings are somehow expected and, with the exception of some of the recommendations given by the author, in line with what the Catholic Church has indicated in this regard,
The NFSS […] clearly reveals that children appear most apt to succeed well as adults—on multiple counts and across a variety of domains—when they spend their entire childhood with their married mother and father, and especially when the parents remain married to the present day.
Additionally, the study highlights a variety of forces uniquely problematic for child development in lesbian and gay families:
-including a lack of social support for parents,
-stress exposure resulting from persistent stigma, and
-modest or absent legal security for their parental and romantic relationship statuses
… While it is certainly accurate to affirm that sexual orientation or parental sexual behavior need have nothing to do with the ability to be a good, effective parent, the data evaluated herein using population-based estimates drawn from a large, nationally-representative sample of young Americans suggest that it may affect the reality of family experiences among a significant number.
Source: Regenerus, M. 2012 How different are the adult children of parents who have same-sex relationships? Findings from the New Family Structures Study, Social Science Research 41(4):752-770