What is the age-order of the Walton kids?

The order is:
1. John-Boy
2. Jason
3. MaryEllen
4. Erin
5. Ben
6. Jim Bob
7. Elizabeth
PS. Jim Bob had a twin that died at birth, Joseph Zebulan. So there were actually eight, like the real life "Waltons" :)

John Boy, Mary Ellen, Jason, Ben, Erin, Jim Bob, Elizabeth

John Boy , Jason , Mary Ellen , Ben , Erin , Jim Bob , Elizabeth

Note * Jim Bob had a twin brother but he died a birth

Note ** Jim Bob was the only Walton Child who was born at the hosptal