What instrument family does the viola belong to?

Answer 1

strings
string family
It's in the string instrument family, along with the cello, double bass, and violin.

Answer 2

The viola comes from the "violin family" although the viola came first. Some people state this as the "viola family." To be more general, you could categorize this as the string family if you include Guitars pianos etc.

Answer 3

The viola is part of the family of string instruments. Other members of this family include the violin, cello, string bass, and harp.