Many people opposed to gay marriage argue that gay parents are largely incapable of raising normal children. Well, perhaps these people are right. Based on the video linked here, these children could be more like extraordinary.
Seems pretty awful to have children grow into adults like him, doesn't it?
Anecdotal evidence aside, research supports the assertion that children raised by lesbians are, on average, happier and less violent than children raised by mixed sex couples. There also is evidence that physical abuse towards children is lower (virtually non-existent even) in lesbian relationships.
It appears then, that at least in terms of lesbian parents, children raised with homosexual parents do just fine.
More research is needed to test the reasons why children raised by lesbians are, in many cases, more peaceful and happier.