I'm wary of comments like "this is the best comedy in years", but I will say this is one of the new comedies I've enjoyed most in recent years. It's not an outright mockumentary like The Office, but it's more in that direction that a straight sitcom like Friends.
The show centres around a retired father and his two grown up children and their families: Jay is the head of the family and married to a younger and hotter Colombian wife who has a child from her previous marriage; Claire is Jay's daughter and has three kids (popular, smart and stupid) and is married to a husband who tries too hard to be 'cool'; and Mitchell is Jay's gay son, who has recently adopted a baby daughter with his melodramatic husband Cameron.
The programme may be called Modern Family, and be focussed on an extreme version of the potential make-up of a family in the twenty-first century, but it riffs on all the dramas any family is likely to stumble upon across three generations, from kids growing up and parents trying to find the right balance between being friends with their children and being tough with them to divorce and remarriage.
I can't guarantee you'll love Modern Family as much as I do, but I'd urge you to do what you can to check out at least one episode as the whole season is of similar quality and style, so if you like one you'll most likely enjoy them all.
Really, this is one of the comedies I've most enjoyed in years.