A rare portrait showing Britain's late Queen Mother with her daughters, Queen Elizabeth II and Princess Margaret, was sold for 90,000 pounds (180,000 dollars) at auction in Britain Thursday, fetching almost double the amount expected, according to dpa. Entitled A Royal Portrait of Elizabeth the Queen Mother and her daughters Princess Elizabeth and Princess Margaret, it was painted in 1936 by Charles Edmund Brock, whose family released it for auction. The Queen Mother and Princess Margaret both died in 2002. The painting had been valued at 50,000 pounds by auctioneers Lyon and Turnbull in Edinburgh, Scotland, where it was bought for almost twice the amount by a fine art broker. It was accompanied by a letter, dated November, 1933, in which the Queen Mother wrote: "I do not like to mention prices etc. but I would like to pay for it and if you would paint us all it would be a delicious picture I know." The artist painted eight versions, six of which were destroyed. One version still hangs in Buckingham Palace.