Cotentitem.ParentID has nothing to do with Category.ParentID. This method call:
Dim listofItems As IList = manager1.GetContent(0, 0, "Name ASC", parentIDArray)
will not work as you think it will. It will filter content items by their parent item not to the category they belong to. Here is sample code:
ICategory = contentManager.GetCategory(
IList = contentManager.GetContent(
, childCategory.CategoryName, SearchCondition.Equal))
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