How is the family unit portrayed in media?

Television shows attempt to portray what an American family looks like. Though there are some exceptions, television attempts to be a lens for American families. The nuclear family (i.e. a male parent and a female parent with children) is the norm for a family unit. This is truer for older television shows such as Seventh Heaven, Meet the Beavers, and many others. However, television is becoming more risque within their portrayal of the family unit. My question when I read this idea is this - Is television really breaking the mold of the "normal" family or molding into the family units of the twenty-first century. During a survey of middle school and high school students, a study has shown that only approximately 5 percent of children live in a family made up of two people who are their biological parents. In other words, only 5 percent of American families consist of two parents and two children. Wow! Think about that. Can we really condemn television for portraying the "family unit" that is indeed a fair reflection of the twenty-first century? A few examples: Two and a Half Men - two brothers raising a young boy and the father sometimes attempting to hook up with the woman he divorced. How about Everybody Loves Raymond. Though it does show a man with a wife and children, it also portrays a man who has not followed the culturally accepted lifestyle of marriage and family because he lives at home with his parents. What about the media's interpretations of the "normal nuclear family?" Two that come to mind are the Simpsons and Family Guy. What do these television shows reflect in regards to the family unit? Is there any values left, within the lens of media, in regards to a nuclear family?