People always forget to ask the kids in these studies.
Kids want to be loved, to feel secure, to have stability. They do not care if it is two mommies or two daddies, or one mommy or one daddy.
Children of homosexual parents are not effected by their own families. It is when they are old enough to go to school and kids start to tell them they are different. Where do the kids get it from? Their parents. It is society that flaws these kid's families, not the parenting from within.
It is just like a lesbian or a gay man. The biggest fear is what others think (society) of them, not what they feel about themselves.