In Africa, drums were a "family of seven"

In Africa, drum ensembles are made up of seven drums in most cases. Since long ago, these seven drums have been referred to as "a family." The drum family consists of "four child drums, a mother drum, and two father drums"!
People who had these various drums would go visit the homes of the other drums and exchange presents and become close like families. When a person who owned one of these drums moved outside of the village or otherwise left, the tribal elders of the houses of the other drums would wail and cry as if they had lost a childhood friend.
Reference: "Musical Instruments," Dohosha Publishing, 1994)

In Africa, drums were a