She means that being a black southerner sucked, but it sucked even worse in the hot summer afternoons, which were hot and humid and uncomfortable and by which time everybody had been working hard all day, than in the mornings, when it was more comfortable and people had just gotten out of bed and weren't completely awake and aware of their lousy situation in life.
Do you have an image of the chart?
Oscar can help his aunt by watering the trees and plants
Oscar's parents may help his aunt around household jobs.
Oscar's grandmother can help his aunt by cooking dinner for the family.
Oscar's siblings can help by washing the dishes and drying them.
She will thank them by saying Thank you and giving them hugs
To write a persuasive essay, you need an argument. Your primary reason for wanting to go somewhere on summer vacation would be called your "thesis." Put your thesis in your introduction, and then elaborate on it. You basically need three reasons, one for each body paragraph, and conclude your argument in the final paragraph, the conclusion. Hope that helps!