Board Thread:General Discussion/@comment-4050367-20140717023819/@comment-25602483-20150310193824

Rumple can see the future not the past. He met cora after she gave birth to Zelena, hence, he only foresaw regina, ergo, he only considered her the first born. He didn't know Zelena was cora's first born which is why he had to do magic maternity test. For the record there is such thing as firstborn. It doesn't matter whether they had different fathers, technically, Zelena was conceived first, hence, first born. With the twins, the first come is the first born, hehe first means the first one to come out.