Mary Humphries- The bad dreams, of red swine (not white), and the bride's bed full of blood, are in Child 74A and the broadsides at the Bodleian.
Sharp's version (white swine) is in Branson, but it is otherwise quite different from the text of your version. The brothers are mentioned in Bodleian and Child 74A texts, but not in the Sharp text in Branson.