Batman Returns (1992)
In Batman Returns the credits list Reubens only as "Penguin's Father", however in Gotham, we learn that Penguin's father is a very wealthy man named Elijah Van Dahl. Van Dahl and Penguin's mother, Gertrude Kapelput (Cobblepot) were very much in love, but due to Elijah's disapproving family they ended the relationship. Gertrude never told Elijah she had become pregnant with Oswald, and it remained secret until after her death. Oswald and Elijah became aware of one another when the two happened to visit Gertrude's grave at the same time.