Whose assassination did the son of Yusupov Palace participate in?
Yusupov Palace (Crimea):  It was built for Prince Felix Yusupov-Soumorokov-Elston, father of Prince Felix Yusupov (1887–1967) in 1909 by Nikolay Krasnov, the architect responsible for the imperial Livadia Palace in nearby Yalta. Felix Yusupov: Prince Felix Felixovich Yusupov, Count Sumarokov-Elston (Russian: Князь Фе́ликс Фе́ликсович Юсу́пов, Граф Сумаро́ков-Эльстон ; 23 March [O.S. 11 March] 1887 – 27 September 1967) was a Russian aristocrat, prince and count from the Yusupov family, best known for participating in the assassination of Grigori Rasputin.
Grigori Rasputin