Use System: For Each (object name)
and also use the instance variables' values as conditions.
Somewhere in your events, you have to randomize OR use another way to put different values in each instance variable of each object instance, because otherwise, using "for each" would be pointless.
families is for grouping different objects together.
Family "ENEMY" would include: Soldier object, Boxer object, Swordsman object, etc.
Based on your description, For Each is what you need, not families. Read more about For Each in the manual.