it is possible, however its pretty trick to get it working properly.
It is not only a lot of work to get it done right, it will also bring certain problems with it which you will have to overcome (eg the Preview Split Screen will not work, you will have to apply some custom javascript I think), so consider this carefully.
Have a look at the silverstripe-blogger module, micmania1 has done a pretty good job there. He uses a GridField to display the blog children (BlogPosts) if you set the config like this:
BlogPost:
show_in_sitetree: false