The Lana Sisters

The Lana Sisters were a British vocal group formed by Iris Long in 1958, with Lynne Abrams. They put an advert in The Stage for a third member and got a reply from Mary O'Brien, who would go on to solo success a few years later as Dusty Springfield.
They were managed by Evelyn Taylor, and toured around England. Initial publicity for the group claimed they were three actual sisters with the surname Lana: Iris (or Riss), Lynne, and... meer