Ricardo's sister, Nélida Odnoposoff (born 1919), was a critically acclaimed Argentine concert pianist whose European debut was in 1935 in Berlin. Growing up in Buenos Aires, she had been a protégée of the Argentine pianist Edmundo Piazzini (es). In Berlin, she studied with Hansi Freudberg. Nélida concertized until the late 1950s. During the early 1940s, she was associated with the Opera and Ballet of MontevideoThe Teatro Solís: 150 Years of Opera, Concert and Ballet in Montevideo, by Susana Salgado, Wesleyan University Press (2003); and soloed with important orchestras of Latin America.Exploring the Musical Mind, by Jacob Kwalwasser (1894–1977), Coleman-Ross Co. (1955); Gran Enciclopedia Argentina (in vol. 6 of 8 vols.), Diego Abad de Santillán (ed.), Buenos Aires: Ediar (1956–1963); , Músicos exiliados del nazismo en la Argentina (1932–1943), by Josefina Irurzun, Revista Brasileira de História das Religiões (journal), Vol. 5, No. 15, January 2013
