Marvel Family of Earth-S
From superman.nu: Supermanica
also known as the Shazam! Family
The Marvel Family is made up of Captain Marvel, Captain Marvel, Jr., Mary Marvel, Uncle Marvel, and Hoppy the Marvel Bunny. They derive their magical powers from the ancient wizard Shazam.
(DCCP No. 34, Jun 1981: "The Beast-Man That Shouted "Hate" at the Heart of the U.N.!"; DCCPA No. 3, 1984: "With One Magic Word")