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In page Dolly Sisters:

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The sisters, Rózsika Deutsch (later known as Rose or Rosie) and Janka Deutsch (later known as Yancsi or Jenny), were born in Balassagyarmat, Hungary.[1] Their parents were Julius (born Gyula Deutsch, c. 1865) and Margaret Deutsch (born Margit Weisz, c. 1874). Julius and son Istvan (later known as Edward, born March 31, 1898) emigrated to the United States in October 1904; the twins and their mother arrived May 1905.[2] As children, the sisters trained as dancers and began earning money in beer halls as early as 1907. Barred for being under age by the New York City stage, they toured the Orpheum Circuit until 1909 when they debuted on the Keith Vaudeville Circuit.[citation needed]