Displaying Brother Pages in PHP

Hello everyone,
I have seen the guide
http://wp-types.com/documentation/user-guides/displaying-brother-pages/
and I like what we are able to achieve in Views plugin, I really love it.

Now to my problem, I would like to exactly the same as in the link above:
Display Brother Pages, but I would like to do it in PHP.

How can I do this?

All kind of help is appreciated.

regards