I think it depends on the situation. If the child is willing to work hard and put in just as much effort as an adult, they should be paid the same amount, especially if they are in need. However, if the child is lazy or irresponsible, they definitely should be paid less.<span />
“Finally” at the beginning of sentence 5 because it makes no sense in the context of the previous sentence and the paragraph in general. Even thought it is the final sentence in the paragraph, the transition doesn’t work in this case. Hope this helps!