I think you're getting slightly confused with your terminology. The 'string family' comprises all the bowed stringed instruments in a standard orchestra: violins, violas, cellos (violoncellos), and double basses. Thus there are four types of instrument in the string family.
Apart from the String instruments there are also the brass, woodwind and percussion families.
Family's - belongs to one family e.g. this is my family's dog Families' - belongs to many families e.g. the families' school was shut
Families is the plural of family (ie one family, two families) Family's is the possessive case of family (eg the family's house or the house of the family) Examples: The were ten families living in the street. The first family'shouse was called "The Pines" There is no such word as familys with no apostrophe.
The plural word for family is families.
there a re 32 families
Three.
A piece of string.
the string family originated from ireland.
it is cause the string bass has 4 strings so it belongs to the string family lol :D
There are many, many unrelated Johnson families, so there are many, many Johnson family trees.
The violin is the smallest member of the string family.
Many families are faithful to other family members. Families are fun.