This really depends on your personal experience. Are you a twin? Do you know twins? You might use the title in different ways. For example, both twins could be obnoxious and terrible people. One could also be good, while the other is not. Another idea would be to focus on the idea of being a twin as what is terrible.
I'm not sure I completely understand the question. If this is an essay, are there two real twins you have in mind? If the twins are imaginary, wouldn't the final product be a fictional story? If the latter, you might want to save the most "terrible" incidents for near the end.
I would disagree that a narrative essay requires telling a story in chronological order. This is an easy way to accomplish this task, but often, narrative essays use elements of story-telling (and creative writing) but as rule, are not required to be one story told in a chronological way.
My best advice for narrative essays is to use real life whereever possible. If you are not a twin yourself, certainly you know some. When I think of "terrible twins" I automatically imagine a worn out mother with twin pre-school boys. Your essay could simply be glimpses into such a parent's day.
Narrative essays are essays which tell a story in chronological order. Similar to a short story, the author of the essay is simply stating things which happened, in the order in which they happened in. Therefore, in an essay on terrible twins, one would want to find a situation where the twins were not on their best behavior. To start, describe what led up to the "action." One then needs to describe what happened and how the "story" ended. Be sure to be descriptive with the atmosphere and the people involved.
Narrative essay is really a small descriptive story about one idea, so, describe a day when going or coming from school, something different happened. As others have said all details don't have 2 b true [poetic license]. put a good hook on the end, make yourself look good.
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