Charles first met Lady Diana Spencer in 1977 while he was visiting her home, Althorp. He was the companion of her elder sister, Sarah, and did not consider Diana romantically until mid-1980. While Charles and Diana were sitting together on a bale of hay at a friend's barbecue in July, she mentioned that he had looked forlorn and in need of care at the funeral of his granduncle Lord Mountbatten. Soon, according to Charles's chosen biographer, Jonathan Dimbleby, "without any apparent surge in feeling, he began to think seriously of her as a potential bride", and she accompanied Charles on visits to Balmoral Castle and Sandringham House.