You are in luck. Daniel and Azuba's children aren't in the Stewart Clan Magazine, but both of them are. Daniel was the son of Ebenezer-4 Stewart (Daniel-3, Daniel-2, Alexander-1), b. 24 Oct 1763 in Paxton, Worcester County, MA, and Relief Read, b. 15 May 1762 in Spencer, MA, dtr of John and Elizabeth (Davis) Read. She was also called Leafy. There is quite an informative paragraph on Ebenezer on D270 (Tome D, p. 270), in the issue of May 1942. Have a look at the Index to the SCM at http://users.hol.gr/~mkyritsi/
to trace the family back. For instance, here are the references for Ebenezer:
Ebenezer MA 1763 s.Dan/LydiaCutting A219, B246, 251, C168, 284, D104, 232, 270, 279
Unfortunately there is no information at all on Azuba Button.