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an ancestry chart up to his great-great-grandparents did not show his imperial descendancy. Expanding it by one level, to great-great-great-grandparents, demonstrates that along paternal line he was son-by-son descendant to the emperor Leopold II. Another benefit of such expansion is that it demonstrates how he related to the last unquestionable king of Spain, Charles IV, an info useful when discussing his claim to the Spanis throne.
Sure this info is „unncecessary”, just like the whole entry is also „unnecessary”. However, I guess it would be nice to let a reader understand what the fuss related to his Spanish claim was all about. Besides, the chart is collapsable and do not see how it can adversely affect the article in any way (clarity? complexity? bias? data overload?).