It's an interesting idea, but how do you handle the case of a row with no children, but a sibling which has children? I've added Jupiter to your example, and you and I both know it is a 'title' but how is the program to deduce that? Not sure that just assuming that if a sibling has children it must be a title despite the lack of children is a good solution — it would fall apart if we needed one of the Venus children to have one or more children, for example.
