https://i.imgur.com/Y9btbAS.png
My first set of twins were identical. They were named Cedar and Paxton. (Cedar on the right and Paxton left.) Paxton was the heir for Gen 1 of my legacy, as he was the firstborn of the twins.
The odd face he's making in this picture was because their little sister Sage (off camera) was messing with him.
Gads, I miss that family. The computer I had them on died, and I was foolish to have not backed up my saves. Got that family up to Gen 6 though. As a side note, multiples seemed to run in that family. Paxton's first kids were twins also, but not identical.