How do I change the score based on the sprite clicked in a family?

My game has random sprites appearing on the screen using a family. When the user clicks on a family instance, the instance is destroyed and the score increases by 1:

This works great as long as their are just enemies in the family, Family_NY_2. However, in addition to randomly generating enemies, I would also like to randomly generate friendly units that should not be clicked, and if they are, the score should decrease. Is there a way to do this using families, or would you suggest an alternative method?

Are friendly units also members of this family? You can define an instance variable "isFriendly" on it, and use it to distinguish friends and enemies in this event.

Looking over the tutorials for family instance variables, they show an example of a "health" variable, and decreasing the value by one when a bullet strikes a member of the family. In my case, I need to set the "IsFriendly" boolean value to "true" for friendly units and "false" with enemy units when a unit is created, then create a condition that checks the value of the "IsFriendly" value when a family sprite is clicked. Is this possible with a family instance variable?

If not, I believe I can get around this by having conditions for the two friendly units, taking specific actions (like decreasing the player's score instead of increasing it) if a friendly unit is hit, and the normal action (increasing the score) if an enemy is hit.

This is doable with instance variable (family instance variables are just "regular" instance variables that are applied to all objects present in a family).

You need to make sure to set the boolean "isFriendly" to true on spawning of your object, when it is a friendly unit.

Then indeed, on click on a family object instance, check the value of its "isFriendly" instance variable.