She is no aristocrat, she is a commoner
She might not be royal, but she is an aristocrat...from both sides of her family.
From her father's side, she is great-grandfather is Louis de Zubiria, Marquis de Yanduri and many other Spanish noble families.
Through her mother's side(Antonia, Edle von Steinhart) she is related to her husband Prince Jean d'Orleans.
Their closest common ancestor was Count Jaroslaw Borita z Martnic.
Here is Philomena's line from Count Jaroslaw:
Count Jaroslaw Borita z Martnic, 1582-1649
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Countess Elisabeth Corrona Borita z Martinic, died in 1649
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Countess Maria Maximiliana Eva Zdiarsky von Zdiar, died in 1690
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Baroness Ludmilla Johanna Hieserle von Chodau, died in 1725
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Franziska Rabenhaupt von Suche, 1682-1732
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Baron Wenzel Franz Obitecky von Obitec-Rabenhaupt und Suche, 1709-1777
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Baron Cajetan Obitecky von Obitec-Rabenhaupt und Suche, 1745-1810
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Baron Franz Obitecky von Obitec-Rabenhaupt und Suche, 1780-1845
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Baroness Marie Johanna Obitecky von Obitec-Rabenhaupt und Suche, 1811-1860
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Baroness Gabriele Wilhelmine Johanna Adelheid Beata von Podstatzky-Prussinowitz und Thonsern, 1848-1913
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Gabriele Sophia Wilhelmine Emma Maria von Michalkowski, 1877-1963
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Gabriele Felicitas Murad von Werner, 1913-1939
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Maria Antonia, Edle von Stinhart, born in 1944
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Maria Philomena Magdalena Juliana Johanna de Tornos y Steinhart, born in 1977
Here is Prince Jean's line from Count Jaroslaw:
Count Jaroslaw Borita z Martnic, 1582-1649
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Countess Ursula Polyxena Borita z Martinic, 1637-1681
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Countess Maria Eleonora von Sternberg-Holicky, 1654-1703
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Count Franz Wenzel von und zu Trauttmansdorff-Weinsberg, 1677-1753
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Countess Maria Theresia von und zu Trauttmansdorff-Weinsberg, 1703-1757
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Count Franz Josef Kottulinsky von Kottulin, 1742-1801
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Count Josef Johann Kottulinsky von Kottulin, 1773-1850
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Count Josef Kottulinsky von Kottulin, 1806-1878
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Countess Elisabeth Kottulinsky von Kottulin, 1850-1929
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Countess Elisabeth Dobrzensky de Dobrzenicz, 1875-1951
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Princess Isabelle d'Orleans-Braganza, 1911-2003
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Prince Henri d'Orleans,Comte de Paris, born in 1933
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Prince Jean d'Orleans,Duke de Vendome,born in 1965