Often a child forum fits under multiple parents. If you place the child under only one parent, then this results in a mass of misplaced threads. Currently the ugly, but only solution is to use linked forums. It is much more elegant to place the child forum in multiple locations in the node tree. Like DigitalPoint has on his forum: https://forums.digitalpoint.com/forums/social-networks.118/ https://forums.digitalpoint.com/forums/google.5/ Google+ forum is listed in both categories.