1st Marvel Family story, but Marvel Family first appears in Captain Marvel Adventures #18; retells origins of Captain Marvel, Captain Marvel, Jr., and Mary Marvel. Inker credit, verified by Marc Swayze, revised from C.C. Beck to Costanza by Craig Delich 2012-7-15.
The Baby Marvel story is often used as an example of the over-abundance of Marvel Family characters and the general silliness of the Marvel Family stories yet Baby Marvel was a Marvel in name only and made only one appearance.
[inside front]:Captain Marvel Club Merchandise; : Mr. J.E. Smith - I Will Show You How to Learn Radio; [inside back cover]: The Marvel Family and Hoppy Hawk Mechanix Illustrated