Then perhaps a feature request.... such as, Create family object, where you can specify the ID of the actual family member. It's too bad this isn't possible.
With respect I'm not sure this really makes sense.
Like, say you have Sprite and Family1, with Sprite a member of Family1.
You're saying something like
System: Create object Family1("Sprite") on layer 0 at (0, 0)
Right now you just do
System: Create object Sprite on layer 0 at (0, 0)
for the same result. Am I understanding correctly?