TFS - Check if a newly created work item has a child

TFS - Check if a newly created work item has a child

I would like to know how to verify that a newly created work item was
assigned a child work item.
Some background info -C# TFS Plugin -If a work item is created, check to
see if existing work item is linked, if not, create one.
I thought there may be a workitem field that is populated that could be
checked for null. Unfortunately, after hours of research on the Extending
TFS portion of MSDN, it doesn't look as if there is such field. More like
multiple linked fields. Needless to say I am very new to TFS API and any
help would be great.