It's difficult, maybe impossible, to identify and pick an object type in a family like this, you don't really use families in this way. It is better to just pick a random number i.e. choose(0,1,2,3) and then the number will apply to the spawning of an object, families will not help here.
When you pick the object to spawn you then put the create object action through a for loop with the choose(2,3) in place as the number of times to loop.
Not sure what the touch event is but you can count the number of objects that were spawned with the result of choose(2,3). If you want the total number of objects in a family it is family.count.