Sorry about your twins...
...I didn't see that they had nicknames. Nicknames are always allowed but often when changes (such as nicknames and ages) are made to the congrats family after each round I sometimes don't see that changes have been made.
So if you do make changes (and I really only allow nicknames and ages to be added after a round has finished) it would be great if you could make a note of those changes so I can make sure they appear with your family from round to round.