Single table at a level
This is the standard hierarchy structure which can be presented in Telerik RadGrid. Through parent table relations or DetailTableDataBind event handling you can generate the content for each table in the grid structure and populate it with data in par with the relations in the grid source.
Detailed information about this common type of Telerik RadGrid hierarchy you can find in the Populating the control with data chapter (topics Programmatic Databinding using NeedDataSource event and Hierarchical data-binding using DetailTableDataBind event) as well as in these online examples: