Answer:
husband would turn into a beast like a werewolf because of the cursed bloodline in the family
The assumption about the change in the characters which I had made was that the husband would turn into a beast like a werewolf because of the cursed bloodline in the family. Since no exact detail was given at the beginning of the story about what the husband would look like once changed, I assumed that he would change into a pale beast with large body. The assumption was inferred upon through these lines "He was white all over then, like a worm's skin. And he turned his face. It was changing while I looked, it got flatter and flatter, the mouth flat and wide, and the teeth grinning flat and dull, and the nose just a knob of flesh with nostril holes, and the ears gone, and the eyes gone blue — blue, with white rims around the blue — staring at me out of that flat, soft, white face."