yes, the photo is of the Dowager Empress Maria Fyodorevna, her daughter Grand Duchess Xenia Alexandrovna, her granddaughter Princess Irina Alexandrovna Yusupova, and her great-granddaughter Princess Irina Felixovna Yusupova - four generations. the photo was taken in either the spring-summer of 1915 (as Princess Irina Felixovna was born in March that year). either at Ai-Todor in the Crimea (estate of Grand Duke Alexander Mikhailovich, Xenia's husband) or at one of the many Imeprial dachas at Peterhof near the Baltic Sea.