The term 'Squid Relatives' refers to octopi, which are six-letter cephalopods that are closely related to squids. Octopi have eight arms and two tentacles, and they are known for their intelligence and ability to solve puzzles. They live in oceans around the world and feed on a variety of prey, including fish, crustaceans, and mollusks. Octopi are also popular in aquariums and are often kept as pets.