Which Beatle came from the most musical family?
None of The Beatles came from families where early piano or recorder lessons were then norm. Music largely came into their lives via the radio and records played on primitive players. Classical music was consciously avoided - the radio would be switched over or off when it came on in the McCartney home.
Musical instruments were around, but not learned in a systematic way. Julia Lennon played banjo and occasionally sang in local pubs. A lodger did provide John with a harmonica, which he intermittently played when he was young. Ringo had to make do with a toy drum provided by a kindly hospital visitor.