Ethel Rainicorn is Lady Rainicorn's mother. She appears in the episode "Her Parents," when Jake meets Ethel and Bob Rainicorn for the first time. To make a good first impression, Jake pretends to be a rainicorn to earn their acceptance. Ethel and Bob, along with other Rainicorns, love to eat human flesh. She, like her husband Bob, likes to play Cameladapuamawamapp.
I've never tasted real human before, but they say you can't even tell the difference. - "Her Parents"