Mrs. Widdershins is the wife of Captain Widdershins and mother to Fiona and Fernald. Not much is known about her but she was most likely on the fire-fighting side. She was one of the original crew members of the Queequeg. Although Widdershins claims she died in a manatee accident, Lemony Snicket later hints that Fiona was correct in her disbelief of this explanation.
- "The submarine Q and its crew of two" refers to her and her husband.
- There is a theory that Mrs. Widdershins and Miranda Caliban are the same, meaning Friday Caliban is also her daughter. Fiona/Friday/Fernald are all F-names.
- The Grim Grotto (mentioned)