Here's an interesting study of how black and white relatives feel about biracial children. Opposition to inter-racial marriage - much more intense in the 1950s and 1960s than opposition to gay marriage today - is based primarily on the issue of the children. Isn't it "selfish" for an interracial couple to have children? The linked study finds that this attitude, while common before marriage and kids, tends to melt with the actual arrival of a multiracial child. When the abstract becomes concrete and human, the prejudice dissolves. The same is true, I think, of gay parenting. In the abstract, some people have issues. When confronted with the reality of gay parenting, when you get to see and meet the actual children, so much fear and prejudice melts away. Of course this doesn't mean that multi-racial kids are the solution to the problem of racism. They're human beings. They're not a solution to anything. They just are.