1906 Sisters Marie of Romania, Grand Princess Victoria Melita, and Princess Beatrice of Orléans Borbón
Marie, seated, was already crown Princess of Romania while Victoria Melita, to right, had divorced and remarried Grand Prince Kyril. Baby Bee, left, married Alfonso of Orléans Borbón. Victoria Melita's second marriage was a success, the others' were not.
I cannot resolve the photographer's name - maybe Whitenhoth.
From ericab16's postings on Webshots; sepia tone removed by gogm.