The Business Services theme has a child theme "business-services-child"

My questions are:
When I go to the path "/public_html/wp-content/themes" I see my active theme "Business Services".

1 Should the "business services child theme" be moved into the same dir as the parent folder "business services"?

2. This theme is called Product. Is it the same Product theme that you find on the WPMUDEV site under the theme tab?

3. If the two themes are to be in the same directory should only the child theme be active.

4. Is the Parent theme to be unmodified and only changes made to the child theme?

5. If the Parent theme is modified how is it returned to is original state?

Thanks