Benny's parents are Gösta and Laila Andersson.
In 1949-1952 the Anderssons lived in Eskilstuna. In 1948 Benny's sister, Eva-Lis Andersson, was born. At the age of 6 Benny got his first musical instrument - accordion, as both his grandfather and father enjoyed music. He was greatly influenced by his grandfather. At the age of 10 he started to take the piano lessons. He was taught by his father Gösta and grandfather Efraim to play Swedish traditional and folk music, as well as popular compositions and songs.