create child pages automaticly?

Hello!

If you look here:

http://www.arvag.net/otkrijte-svet/leto/

You can see i am listing all child pages for that page.

Now, when you open any of those child pages, what i want is to have something like this:

http://www.arvag.net/otkrijte-svet/leto/zakynthos/
http://www.arvag.net/otkrijte-svet/leto/zakynthos/vise-o
http://www.arvag.net/otkrijte-svet/leto/zakynthos/prijava
http://www.arvag.net/otkrijte-svet/leto/zakynthos/galerija

So i want to have 3 child pages for this page.

Problem is that i will have many pages like this one, and all of them will need the same 3 child pages, with different content of course.

So is there some way, like plugin or something, so when i create one of these pages, those 3 child pages are created automatically? Or some way for me to control, in admin panel, those 3 child pages from within that parent page?

If it were only me who would be working on this site, i would do that all manually, i mean its just several clicks more to create those pages, but i want to make this in such a way that client can also jump in admin panel and do something on his own, so i really need some simple solution for this.

Thanks!