 They were married a year later, and had one child, Igor Oistrakh, who was born in 1931.Igor Oistrakh would follow his father's path as a violinist, and eventually performed and recorded side-by-side with his father, including Bach's Double Concerto, which they first recorded in 1951, and Mozart's Sinfonia Concertante.In at least one of the recordings of Mozart's Sinfonia Concertante, Igor Oistrakh played violin, while Oistrakh played viola.