I'm a bit surprised that they havent fixed the genetic twin creation yet with this pack. Seriously, the game seems to think that "Create Twin = Clone of original"
This is not correct. At least, in my games, I intend for twins to be diametrics of the parents, each exhibits some of both parent's traits/genetics.. Usually, I'll have an Alien/vampire couple and will hit the genetic tool in CAS. Once I have a suitable looking spawn/child, my intent is to create a twin for the child, but with the other parents qualities. But because of how the genetics tool in CAS works, the create twin button may as well be the create clone button and I have to go back to the parental level and do create child again.
This is what I had to do with one of my newer families, strangely, the boy that was created after the girl, turned out older than the girl when I noticed, and I had to PoY both of them to fix it.
Some of these issues could be rectified with a few tweaks to the create Twin or child genetics box in CAS.
A couple questions added:
"Will this child be older or younger?"
"Parental genetics considered"
With the former of the two questions, you could actually kill the create twin genetic box entirely, but the latter question is good for adding to the Twin creation box. Just offering some thought as to how CAS could be improved. Makes sense to do something with this as we have infants now...