I just discovered that I can show a parent-child relationship using a list view control. That part was easy. But what I need to do now is one more level deep. I'll give the scenario:

I have a form for Servers in our environment. I have a list view showing all the SQL Server Instances installed, and that's working fine. But now I need another list that shows all the databases on the instances that are displayed in the first list.

In the standard SharePoint forms I'm able to use web parts and use the "connections" to do all the filtering. It works really well, but there's the severe problem of the forms being ugly, and well, all the reasons Nintex forms are superior.