I'm going to lock this as I'm not even sure if it was still an issue after the infant patch.
If you do still have issues with toddlers, please create a new thread.
@SimGuruNick Do you still need saves? My two sim dads had a baby girl and a baby boy. I just aged up the girl and neither parent has any relationship with her. I noticed while attempting to have the dads potty train her. They have the introductions and give food from inventory options only. I will send my save upon request. Thanks!
Update: I wanted to add that both parents show up in the toddler girl's relationship panel. Both of them are labeled "Father". I kept the test save and created a different save to keep playing. After one dad's introduction, he had the option to potty train and things seem normal. Although, I went through the same thing after I aged up the boy. Both dads had to be introduced to him first. One other thing that is annoying about this is that while one toddler was on the potty, the unintroduced dad kept leaving and would not stay in the room in order to potty train the other toddler (both training potties are in the kids' room) and the toddler who was in the middle of potty training stopped and got up from the potty.
