CMS Made Simple Forums

I am using menu manager and need a way to get a list of my child's parent's siblings.  Ex:
1
2
2.1
2.2
2.2.1
2.2.2
2.3
2.4
3
4
4.1
4.2
4.3

I when I am on page 2.2.1 I want a nav to show 2.1, 2.2,2.3,&2.4.

Is this possible with menu manager?

Have you looked at the default content for a menu like that?...

http://dezertdesign.com/default/index.php?page=navleft