(Reuters) – U.S. singer Dorothy McGuire, who with her two sisters made dozens of hit records in the 1950s and 1960s, has died in Arizona, her son said on Sunday. McGuire, 84, died on Friday at her home in Paradise Valley, Arizona, her son Rex Williamson told Reuters. She had suffered for some time from Parkinson’s disease, he said. Dorothy McGuire was the middle sister of The McGuire Sisters – Christine, Phyllis and Dorothy – who had hits with “Goodnite, Sweetheart, Goodnite”, “Sincerely” and “Sugartime” and were often compared to their 1940s predecessors, The Andrews Sisters. …