The Almighty Johnsons Wiki

Elna Johnson was the grandmother of the Johnson brothers and Olaf's second wife. She was also the mother of Johan and mother in law to Elizabet/Agnetha. She was a goddess but it is unknown which one, it is revealed she had a sister who was also a goddess. They once set a mailman on fire. As stated by Olaf she understood why Olaf never aged because she was a goddess.