The McGuire Sisters were a singing trio in American popular music. The group was composed of three sisters: Ruby Christine McGuire (July 30, 1926 – December 28, 2018), Dorothy "Dottie" McGuire (February 13, 1928 – September 7, 2012) and Phyllis McGuire (February 14, 1931 – 2020). Among their most popular songs are "Sincerely" and "Sugartime", both number-one hits. The McGuire sisters were born in Middletown, Ohio, and grew up in Miamisburg near Dayton .