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In page Alexander Tudor-Hart:

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Percyval was the grandson of the successful American businessman Frederic Tudor. He and his brother William Owen Tudor-Hart DSO[4] both changed their surname to Tudor-Hart in adulthood, possibly to strengthen their ties to the Tudor name. Their parents were divorced owing to their father being a "constant and habitual frequenter of houses of ill-fame" in Montreal.[5] Percyval's first wife (Alexander's mother) was the daughter of his aunt Euphemia "Effie" Tudor-Kleczkowska, who had married the Polish-French diplomat Michel Alexandre Cholewa, comte Kleczkowski (Michał Kleczkowski; 1818–1886). Kleczkowski was the only son of Count Joseph Kleczkowski and Julie Sobieska, a direct descendant of John III Sobieski, king of Poland in the 17th century.[6][7]