As I've been writing a series of articles on the Marvel Family, I thought it would be helpful to include a timeline showing when each family member made their appearance in Captain Marvel's comics.
Here's the timeline for when each family member appeared, the cover of the comic, and the date of publication (according to Mike's Amazing World of Comics).
1. Captain Marvel
The world's mightiest mortal first appeared in Whiz Comics #2 published December 1, 1939.
2. The Lieutenant Marvels
Tall Billy, Fat Billy, and Hill Billy became the Lieutenant Marvels in Whiz Comics #21, published on August 8, 1941.
3. Captain Marvel, Junior
Freddy Freeman becomes Captain Marvel, Junior in Whiz Comics #25 and published on November 28, 1941.
4. Mary Marvel
Mary Batson, Billy's twin sister, becomes Mary Marvel in Captain Marvel Adventures #18 which published on November 13, 1942.
5. Uncle Marvel
Uncle Marvel meets Mary Marvel in Wow Comics #18, published on September 15, 1943.
6. Freckles Marvel
Freckles Marvel, niece of Uncle Dudley, made her debut with Mary Marvel in Wow Comics #35 which published on March 23, 1945.
7. Tawky Tawny
Mr. Tawny - the talking tiger - first met Captain Marvel on September 26, 1947 when Captain Marvel Adventures #79 published.
Although each Marvel Family member may not have super powers, they each contribute to the depth and unique character of Captain Marvel's comics. Cap's adventures just wouldn't be the same without the contributions of each Marvel Family member!