Ummm, are you saying that C is the grandparent of C, or do you have a typo in your example? Sure, the initial comment is not necessarily the grandparent, but in your ABCDE example, A is the grandparent of C, and C is the grandparent of E.
Maybe I'm just misreading your comment, but it has me confused enough to reset my password, login, and make this child comment.
Maybe I'm just misreading your comment, but it has me confused enough to reset my password, login, and make this child comment.