Modern Family is a comedy series about an extended family. I don't pay attention to names too much so I'm going to give you the family breakdown, but it won't have names because I just can't remember them!
We'll start with the Grandfather. Follow along cuz it'll get confusing. The grandfather has three kids. A son, a daughter, and a step son. The son and daughter are prolly mid 30's age. The step son is about 10. The step-son comes from his marriage to a Columbian hottie who is probably mid 30's as well. His son is gay, and has a partner with whom he just adopted a Vietnamese infant. His daughter is married with three kids. The step son and one of the grandkids are in the same grade, and because of the interesting family arrangement, they are also Uncle/Nephew. The step son also has an innocent pre-pubescent crush on the oldest granddaughter.
Did you follow all that? If not, you're not the first. It's tough. But thats what makes it so funny. Most of the shows have some form of a moral lesson in them, but they come to learn them through the regular happenings of an extended family like this.
Due to the lack of drama(sorry, but its my thing) I am going to give this show a FANTASTICAL rating. It's well worth the time to watch.