I said I would track down another new study by Professor Daniel Potter analyzing existing nationally representative data that just came out in the June issue of Journal of Marriage and Family.
To examine whether same-sex parent families represent an exception among nontraditional families, the author used data from the Early Childhood Longitudinal Study — Kindergarten cohort (N = 19,043) to create a dynamic indicator of children’s family structure and tested its association with math assessment scores. The results indicated that children in same-sex parent families scored lower than their peers in married, 2-biological parent households, but the difference was nonsignificant net of family transitions.
In other words, on average, children raised by intact married biological families do better. This may have more to do with the fact that fragile as they now are, intact married biological unions are more stable than any other family form we know of.