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Gets the parent object for the specified threaded comment.
The top-level threaded comment's parent is null. For a reply, this method
returns the threaded comment that the reply belongs to.
ICommentThreaded Parent { get; }
ReadOnly Property Parent As ICommentThreaded
ICommentThreaded comment = worksheet.Range["A1"].AddCommentThreaded("Review this value", "Alex");
ICommentThreaded reply = comment.AddReply("I updated the number.", "Jamie");
ICommentThreaded parent = reply.Parent;