Aberbach's brother Jean joined in the early 1950s after working for Chappell Music, and thereafter the two shared control of the company, with Jean Aberbach being based in the Brill Building in New York City.
Saudara Aberbach Jean bergabung pada awal 1950an setelah bekerja untuk Chappell Music, dan setelah itu keduanya berbagi kontrol atas perusahaan tersebut, dengan Jean Aberbach berbasis di Brill Building, New York City.