A speech given by a politician is a good example of an essay. An essay is a long text that has an introduction, a body and a conclusion. Moreover, an essay has a thesis and arguments. Most of the time, essays attempt to be persuasive and defend a particular point of view. These are all qualities that can be found in a speech from a politician.
Try to think of a disagreement or agreement you've EVER had with a family member. Even if you are exaggeration or making a bit of it up I believe it to be fine. Write about something simple like disagreement over the last cookie or bed time.