How can Sims move to a house where a child is living in?

@beaupleijsier

I don't think you can. Other players have had this problem when they split up Sim couples. The best you can do is to send the child to the house where the couple is living. The child won't go home unless you send him home. Of course if you have four sims living in a house together there is no room for the child. You will need to move one couple to another house and then just send the child to that house.