Annie and Billy look and act like their parent's enemies
Subverted: Annie looks like Alice, but her personality and her role are completely different. Billy looks like Bob, but is otherwise completely different.
Double Subverted: Annie's personality and role are Bob's personality and role, and Billy's are Alice's.
Parodied: Everyone in their community is an exact replica of their parents.
Deconstructed: Annie and Billy are just like Alice and Bob, because they've been raised to be. Alice and Bob wanted mini versions of themselves, and they got miniature versions of themselves, perhaps to "live through" their children. Annie and Billy, however, are reaching the age where they want to be themselves.
Reconstructed: Annie and Billy learn to be themselves, but still retain some of the best character traits of Alice and Bob. Even if they did happen to change their hair and style of clothes, and develop their own personalities and interests. Because they have Alice and Bob's good traits, the next generation is even more successful than the last.
Zig Zagged: Sometimes Annie and Billy act and dress like their parents, and sometimes they don't.
Averted: Annie and Billy don't look and act like Alice and Bob very much.
Lampshaded: "Annie, you look just like your mother!"
"Billy, you're the spitting image of your father!"
Invoked: Annie and Billy don't naturally look like Alice and Bob, but they admire them so much that they start copying Alice and Bob's hairstyles, clothing, hair colors, etc.
Defied: Annie and Billy dye their hair and style it completely different than their parents. They wear different clothes than their parents do and try to be the opposite of their parents. (i.e. If Alice is The Chick, then Annie strives to be the Action Girl. If Bob was the quarterback on the football team, Billy joins Chess Club at school.)
Discussed: "Those kids are just like their parents! Freaky!
Conversed: "I know! Don't they, like, wanna be themselves or anything?"
Played For Laughs: Annie and Billy resemble Alice and Bob so closely it hurts, but are not Alice and Bob's children, and are not even related to Alice and Bob.
Played For Drama: Annie and Billy learn to be themselves, and not copies of their parents.