ump. Us there at least a way to know what sprite had been spawned in the family?
Use a series of sub-events to the spawn action.
Sprite1 | pick instance with UID Family.UID
Sprite2 | pick instance with UID Family.UID
Sprite3 | pick instance with UID Family.UID
or one sub-event per object type in the family. Only one of them will evaluate true. Another approach would be to use a family variable indicating what the object type is.