Which is the child theme and which is the parent theme?

Your site is not using a Child Theme.

It is currently using the WordFruit Theme, and this Theme does not declare any Theme as a Template. If it were, you would see a Template: parent-theme header tag (where “parent-theme” would be, e.g. twentyeleven if it were using Twenty Eleven as its parent Theme) in style.css

Thus, WordFruit appears to be a stand-alone Theme.

So, if you want to make changes to WordFruit, you would need to make changes to the Theme directly, or create a Child Theme that uses Wordfruit as its template (Parent Theme).