They were the daughters of Princess Maria Anna of Anhalt-Dessau/Prussia. According to Princess Marie’s Wikipedia article, she became the second wife of Prince Henry of the Netherlands and then the first wife of Prince Albert of Saxe-Altenburg. The first marriage produced no children while the second produced two girls, Olga Elisabeth and Marie of Saxe-Altenburg. According to Princess Elisabeth Anna’s Wikipedia article, she had one child who survived to adulthood, Sophie Charlotte of Oldenburg who married Kaiser Wilhelm II’s son Eitel Friedrich. The little girl, Luise Margaret, married Queen Victoria’s son Prince Aurthur to become Duchess of Connaught who is covered in her own Subalbum.