Should I tutor this 3rd grader?

I found an ad at my college asking for a tutor for an third grader in Reading, English, and Writing. When I called the mother was really excited and wants to meet me, however both my parents are extremely against it saying I'm not mature enough, qualified, and I should focus on my studies. However I'm trying become more independent, and really want to. Also, the childs mother has had a stroke (as she repeatedly explained to me) and also lost her husband, which she blames for childs lacking grades, and is obviously a little out of it. Also, if I did, what would I charge since it's three subjects and a 3rd grader?