In my opinion, family is what WE make of it. For my friends who were abused as children, they have created a family of supportive friends. They don't necessarily live in the same home, but they support each other as parents and siblings are supposed to do.
In a somewhat stricter sense of the word, family is a group of people who choose to share their lives and/or resources. Sometimes this involves child rearing. Sometimes it does not. I don't care what the gender, color, sexual orientation, age, or hairstyle these people have. If they choose to be a family, who am I to deny them? Family may include legal protections such as marriage, adoption, domestic partnership agreements, etc. For legal purposes, some of these are necessary to gain full benefits of family.
What I don't understand about christians like Cathy is how other people's view of family or marriage threatens his own. He can still marry a woman. He can live with her, have babies with her, visit her at her hospital bedside, put her on his insurance, and so on ad nauseum. How is anyone else's family situation ANY reflection or denegration of his???