Rasputin and his followers, 1914. Alexander von Pistohlkors is Princess Olga Paley's (2nd and morganatic wife of Grand Duke Pavel) oldest child from her first marriage. Alexander and his wife were both followers of Rasputin and were close to the Imperial family as well. In fact, Grand duchess Olga was the Godmother to their daughter Olga, and Grand duchess Tatiana to their daughter Tatiana. Alexander's relationship impacted his mother, stepfather and half-siblings, allowing them to return to Russia and even after Grand duke Pavel asked Nicholas II to allow a Constitution, remain in the family's favor. Alexander's sister Marianna on the other hand, was accused (one of the only 2 women accused) of participating in Rasputin's murder. Nicholas, knowing his uncle was in poor health, especially after Pavel's son Dmitri was already banished to the Persian Front, didn't punish Marianna (Pavel's stepdaughter). We only know of her alleged involvement because of a letter written by Prince Felix Yusupov to his wife Irina saying "Malanya's also taking part," which was Marianna's nickname. Of course this was 2 weeks before, so it is unknown whether or not she went through with it.
Rasputin and his followers, 1914. The two circled at the far left are Alexander von Pistohlkors and his wife Alexandra von Pistohlkors (who was pregnant at the time). The other woman circled is Anna Vyrubova the famous friend and confidant of Empress Alexandra Feodorovna, also the older sister to Alexander von Pistohlkors.